Names starting with O: Oak to Oladele
300 first names from SSA's national file, part 1 of 5 of the O directory. 93 link to their full record; for the other 207, the row is NameAlmanac's record: the babies given the name since 1880, the years SSA recorded it (5 or more babies of one sex in a year), its peak year and its 2025 births.
Names: SSA national file, 1880-2025, published May 8, 2026. SSA’s notes on the data. SSA lists a name in a year only when 5 or more babies of one sex got it.
Oak to Oladele
| Name | Given to | Babies since 1880 | On record | Peak year | Babies in 2025 |
|---|---|---|---|---|---|
| Oak | Boys | 674 | 1920-2025, 25 years | 2023 | 59 |
| Oaken | Boys | 184 | 2013-2025, 13 years | 2019 | 20 |
| Oakes | Boys | 283 | 2012-2025, 14 years | 2025 | 56 |
| Oakey | Boys | 5 | 1922, 1 year | 1922 | under 5 |
| Oakie | Both, 50% girls | 20 | 1920-1957, 4 years | 1920 | under 5 |
| Oaklan | Boys | 299 | 2012-2025, 13 years | 2024 | 25 |
| Oakland | Both, 17% girls | 1,701 | 1919-2025, 30 years | 2025 | 208 |
| Oaklea | Girls | 76 | 2015-2025, 10 years | 2025 | 12 |
| Oaklee | Both, 85% girls | 6,593 | 1999-2025, 27 years | 2022 | 640 |
| Oaklei | Girls | 117 | 2014-2025, 11 years | 2023 | 12 |
| Oakleigh | Girls | 4,138 | 2005-2025, 21 years | 2022 | 423 |
| Oaklen | Boys | 783 | 2011-2025, 14 years | 2023 | 68 |
| Oakley | Both, 57% girls | 26,745 | 1884-2025, 133 years | 2024 | 2,621 |
| Oakleymae | Girls | 6 | 2023, 1 year | 2023 | under 5 |
| Oakli | Girls | 71 | 2012-2024, 10 years | 2017 | under 5 |
| Oaklie | Girls | 753 | 2002-2025, 24 years | 2021 | 54 |
| Oakliegh | Girls | 5 | 2021, 1 year | 2021 | under 5 |
| Oaklin | Both, 40% girls | 235 | 2015-2025, 10 years | 2021 | 20 |
| Oaklinn | Girls | 33 | 2020-2024, 5 years | 2021 | under 5 |
| Oaklon | Boys | 6 | 2023, 1 year | 2023 | under 5 |
| Oakly | Both, 35% girls | 62 | 2010-2025, 8 years | 2022 | 6 |
| Oaklyn | Girls | 5,400 | 2006-2025, 18 years | 2018 | 479 |
| Oaklynd | Both, 31% girls | 88 | 2016-2025, 9 years | 2022 | 11 |
| Oaklyne | Girls | 6 | 2025, 1 year | 2025 | 6 |
| Oaklynn | Girls | 11,863 | 2008-2025, 16 years | 2025 | 1,973 |
| Oaklynne | Girls | 186 | 2017-2025, 9 years | 2023 | 23 |
| Oaks | Boys | 280 | 2013-2025, 12 years | 2024 | 43 |
| Oana | Girls | 10 | 2022-2023, 2 years | 2022 | under 5 |
| Oanh | Girls | 238 | 1977-2002, 20 years | 1981 | under 5 |
| Oasis | Both, 80% girls | 383 | 1995-2025, 26 years | 2025 | 36 |
| Oatha | Girls | 5 | 1936, 1 year | 1936 | under 5 |
| Oather | Boys | 443 | 1882-1973, 46 years | 1919 | under 5 |
| Oatis | Boys | 46 | 1916-1941, 8 years | 1926 | under 5 |
| Oba | Boys | 67 | 1915-2023, 12 years | 1974 | under 5 |
| Obada | Boys | 32 | 1997-2016, 5 years | 2011 | under 5 |
| Obadiah | Boys | 2,521 | 1914-2025, 86 years | 2024 | 104 |
| Obafemi | Boys | 10 | 2006-2017, 2 years | 2006 | under 5 |
| Obai | Boys | 35 | 2018-2025, 6 years | 2023 | 5 |
| Obaid | Boys | 15 | 1993-2013, 3 years | 1993 | under 5 |
| Obaida | Boys | 58 | 2013-2025, 5 years | 2024 | 17 |
| Obaidullah | Boys | 10 | 2022-2023, 2 years | 2022 | under 5 |
| Obaloluwa | Boys | 146 | 2005-2025, 15 years | 2019 | 7 |
| Obama | Boys | 30 | 2008-2009, 2 years | 2009 | under 5 |
| Oban | Boys | 23 | 2017-2022, 4 years | 2021 | under 5 |
| Obasi | Boys | 5 | 1996, 1 year | 1996 | under 5 |
| Obbie | Boys | 296 | 1912-2004, 43 years | 1920 | under 5 |
| Obdulia | Girls | 163 | 1920-1999, 25 years | 1975 | under 5 |
| Obdulio | Boys | 68 | 1963-2007, 12 years | 1991 | under 5 |
| Obe | Boys | 73 | 1881-1948, 12 years | 1916 | under 5 |
| Obed | Boys | 4,135 | 1880-2025, 115 years | 2005 | 72 |
| Obeda | Girls | 5 | 1925, 1 year | 1925 | under 5 |
| Obediah | Boys | 226 | 1912-2025, 39 years | 1954 | 5 |
| Obehi | Girls | 5 | 2009, 1 year | 2009 | under 5 |
| Obelia | Girls | 77 | 1909-1943, 12 years | 1918 | under 5 |
| Ober | Boys | 15 | 1916-1927, 3 years | 1916 | under 5 |
| Obera | Girls | 216 | 1903-1951, 25 years | 1915 | under 5 |
| Oberia | Girls | 68 | 1915-1932, 11 years | 1919 | under 5 |
| Oberon | Boys | 283 | 2007-2025, 17 years | 2021 | 17 |
| Obert | Boys | 619 | 1895-1988, 59 years | 1921 | under 5 |
| Oberta | Girls | 6 | 1921, 1 year | 1921 | under 5 |
| Oberyn | Boys | 119 | 2015-2025, 11 years | 2019 | 7 |
| Obet | Boys | 26 | 1995-2008, 4 years | 2001 | under 5 |
| Obeth | Boys | 48 | 1994-2018, 8 years | 2011 | under 5 |
| Obey | Boys | 16 | 1920-1955, 3 years | 1920 | under 5 |
| Obi | Boys | 299 | 2007-2025, 18 years | 2022 | 29 |
| Obianuju | Girls | 28 | 1996-2019, 5 years | 2007 | under 5 |
| Obichukwu | Boys | 5 | 2017, 1 year | 2017 | under 5 |
| Obidiah | Boys | 16 | 2020-2024, 2 years | 2024 | under 5 |
| Obie | Boys | 4,436 | 1880-2025, 144 years | 1924 | 10 |
| Obieze | Boys | 5 | 2022, 1 year | 2022 | under 5 |
| Obinna | Boys | 874 | 1977-2025, 49 years | 2006 | 16 |
| Obiora | Boys | 6 | 2014, 1 year | 2014 | under 5 |
| Obra | Boys | 59 | 1918-1982, 11 years | 1931 | under 5 |
| Obrain | Boys | 5 | 1985, 1 year | 1985 | under 5 |
| Obrempong | Boys | 30 | 2021-2025, 5 years | 2024 | 6 |
| Obrey | Boys | 5 | 1919, 1 year | 1919 | under 5 |
| Obrian | Boys | 482 | 1967-2022, 44 years | 1987 | under 5 |
| Obrien | Boys | 209 | 1921-2022, 24 years | 1991 | under 5 |
| Obry | Boys | 5 | 1916, 1 year | 1916 | under 5 |
| Obryan | Boys | 301 | 1982-2021, 32 years | 1984 | under 5 |
| Obryant | Boys | 31 | 1986-2009, 4 years | 1989 | under 5 |
| Obsa | Boys | 16 | 2015-2023, 3 years | 2015 | under 5 |
| Obsidian | Boys | 134 | 2013-2025, 10 years | 2023 | 16 |
| Oby | Boys | 11 | 1917-1924, 2 years | 1924 | under 5 |
| Oc | Boys | 24 | 1920-1928, 4 years | 1921 | under 5 |
| Oca | Girls | 16 | 1894-1917, 3 years | 1894 | under 5 |
| Ocasio | Boys | 5 | 1980, 1 year | 1980 | under 5 |
| Occie | Girls | 38 | 1913-1933, 7 years | 1923 | under 5 |
| Oce | Boys | 5 | 1923, 1 year | 1923 | under 5 |
| Ocea | Girls | 27 | 1895-2022, 5 years | 1918 | under 5 |
| Oceal | Girls | 16 | 1922-1927, 3 years | 1927 | under 5 |
| Ocean | Both, 46% girls | 8,233 | 1971-2025, 41 years | 2022 | 720 |
| Oceana | Girls | 1,147 | 1915-2025, 42 years | 2004 | 43 |
| Oceane | Girls | 208 | 2002-2025, 22 years | 2023 | 10 |
| Oceania | Girls | 78 | 1990-2023, 12 years | 2018 | under 5 |
| Oceann | Both, 82% girls | 71 | 2019-2025, 6 years | 2023 | 10 |
| Oceanna | Girls | 474 | 1989-2025, 37 years | 2006 | 5 |
| Oceano | Boys | 29 | 2021-2024, 4 years | 2021 | under 5 |
| Oceanus | Boys | 6 | 2024, 1 year | 2024 | under 5 |
| Ocelia | Girls | 32 | 1919-1932, 5 years | 1921 | under 5 |
| Ocella | Girls | 5 | 1926, 1 year | 1926 | under 5 |
| Ocelotl | Boys | 5 | 2016, 1 year | 2016 | under 5 |
| Oceola | Girls | 21 | 1913-1931, 4 years | 1926 | under 5 |
| Ocey | Girls | 6 | 1906, 1 year | 1906 | under 5 |
| Ocia | Girls | 122 | 1894-1934, 19 years | 1920 | under 5 |
| Ocie | Both, 60% girls | 6,871 | 1880-2025, 129 years | 1916 | 20 |
| Ociel | Boys | 499 | 1980-2025, 41 years | 2008 | 17 |
| Oconner | Boys | 5 | 2018, 1 year | 2018 | under 5 |
| Oconnor | Boys | 28 | 2006-2020, 4 years | 2015 | under 5 |
| Octa | Girls | 160 | 1885-1941, 22 years | 1915 | under 5 |
| Octabio | Boys | 7 | 1980, 1 year | 1980 | under 5 |
| Octava | Girls | 41 | 1894-1931, 7 years | 1921 | under 5 |
| Octave | Boys | 450 | 1880-2024, 53 years | 1918 | under 5 |
| Octavia | Girls | 24,117 | 1880-2025, 146 years | 2021 | 982 |
| Octaviah | Girls | 42 | 2017-2024, 6 years | 2021 | under 5 |
| Octavian | Boys | 1,481 | 1970-2025, 55 years | 2021 | 51 |
| Octaviana | Girls | 11 | 1925-2008, 2 years | 1925 | under 5 |
| Octaviano | Boys | 689 | 1914-2023, 86 years | 1949 | under 5 |
| Octavie | Girls | 176 | 1883-1926, 26 years | 1920 | under 5 |
| Octavien | Boys | 23 | 1997-2008, 4 years | 2003 | under 5 |
| Octavio | Boys | 11,454 | 1908-2025, 115 years | 2003 | 154 |
| Octavion | Boys | 195 | 1990-2025, 22 years | 2006 | 6 |
| Octavious | Boys | 1,674 | 1917-2025, 60 years | 1992 | 17 |
| Octavis | Boys | 289 | 1973-2015, 33 years | 1980 | under 5 |
| Octavius | Boys | 3,702 | 1911-2025, 75 years | 1991 | 72 |
| Octavus | Boys | 5 | 1989, 1 year | 1989 | under 5 |
| Octavya | Girls | 13 | 2022-2024, 2 years | 2024 | under 5 |
| Octayvia | Girls | 89 | 1992-2025, 15 years | 2023 | 5 |
| Octivia | Girls | 68 | 1976-2000, 11 years | 1993 | under 5 |
| October | Girls | 1,342 | 1969-2025, 43 years | 2022 | 49 |
| Ocyris | Boys | 5 | 2024, 1 year | 2024 | under 5 |
| Ocyrus | Boys | 19 | 2020-2024, 3 years | 2020 | under 5 |
| Od | Boys | 5 | 1917, 1 year | 1917 | under 5 |
| Oda | Both, 81% girls | 1,625 | 1880-1962, 71 years | 1918 | under 5 |
| Odai | Boys | 139 | 1990-2025, 20 years | 2022 | 12 |
| Odali | Girls | 40 | 1996-2005, 6 years | 1998 | under 5 |
| Odalis | Girls | 2,696 | 1963-2025, 49 years | 1998 | 11 |
| Odaliz | Girls | 269 | 1984-2017, 20 years | 1996 | under 5 |
| Odaly | Girls | 77 | 1995-2012, 12 years | 2001 | under 5 |
| Odalys | Girls | 3,424 | 1960-2025, 58 years | 1996 | 39 |
| Odalyz | Girls | 17 | 1997-2003, 3 years | 1997 | under 5 |
| Odaniel | Boys | 5 | 1938, 1 year | 1938 | under 5 |
| Odarius | Boys | 82 | 1988-2009, 13 years | 1993 | under 5 |
| Odarrius | Boys | 6 | 1996, 1 year | 1996 | under 5 |
| Odas | Boys | 148 | 1914-1941, 21 years | 1917 | under 5 |
| Oday | Boys | 164 | 1991-2025, 14 years | 2018 | 15 |
| Odbert | Boys | 5 | 1923, 1 year | 1923 | under 5 |
| Oddie | Both, 43% girls | 600 | 1894-1975, 48 years | 1919 | under 5 |
| Oddis | Boys | 87 | 1916-1950, 14 years | 1922 | under 5 |
| Ode | Boys | 28 | 1886-1927, 5 years | 1927 | under 5 |
| Odeal | Girls | 315 | 1900-1951, 35 years | 1916 | under 5 |
| Odean | Both, 52% girls | 728 | 1914-1964, 43 years | 1924 | under 5 |
| Oded | Boys | 6 | 1974, 1 year | 1974 | under 5 |
| Odeh | Boys | 11 | 1982-1994, 2 years | 1994 | under 5 |
| Odel | Boys | 186 | 1914-2016, 25 years | 1925 | under 5 |
| Odelia | Girls | 2,860 | 1880-2025, 136 years | 2024 | 56 |
| Odeliah | Girls | 5 | 2025, 1 year | 2025 | 5 |
| Odelis | Girls | 5 | 2025, 1 year | 2025 | 5 |
| Odell | Both, 22% girls | 19,034 | 1883-2025, 138 years | 1922 | 23 |
| Odella | Girls | 828 | 1897-2025, 66 years | 1919 | 7 |
| Odelle | Girls | 434 | 1902-1946, 36 years | 1916 | under 5 |
| Odelya | Girls | 7 | 2021, 1 year | 2021 | under 5 |
| Oden | Boys | 1,574 | 1912-2025, 51 years | 2022 | 74 |
| Odena | Girls | 97 | 1914-1945, 12 years | 1921 | under 5 |
| Odene | Both, 88% girls | 41 | 1918-1930, 7 years | 1919 | under 5 |
| Oder | Boys | 5 | 1915, 1 year | 1915 | under 5 |
| Odera | Both, 38% girls | 37 | 1999-2025, 4 years | 1999 | 5 |
| Odes | Boys | 367 | 1888-1955, 36 years | 1923 | under 5 |
| Odesa | Girls | 10 | 1920-2023, 2 years | 1920 | under 5 |
| Odessa | Girls | 18,718 | 1880-2025, 146 years | 1920 | 193 |
| Odesser | Girls | 169 | 1911-1942, 22 years | 1916 | under 5 |
| Odessey | Girls | 25 | 1996-2002, 4 years | 2000 | under 5 |
| Odessia | Girls | 601 | 1901-1975, 52 years | 1922 | under 5 |
| Odessie | Girls | 597 | 1897-1949, 45 years | 1923 | under 5 |
| Odester | Girls | 127 | 1920-1960, 19 years | 1933 | under 5 |
| Odesza | Girls | 68 | 2017-2025, 8 years | 2023 | 10 |
| Odet | Girls | 7 | 2001, 1 year | 2001 | under 5 |
| Odete | Girls | 5 | 1974, 1 year | 1974 | under 5 |
| Odeth | Girls | 63 | 1995-2013, 9 years | 2000 | under 5 |
| Odett | Girls | 11 | 2000-2003, 2 years | 2000 | under 5 |
| Odetta | Girls | 628 | 1900-2024, 63 years | 1922 | under 5 |
| Odette | Girls | 4,239 | 1894-2025, 129 years | 2025 | 303 |
| Odeya | Girls | 75 | 2017-2025, 9 years | 2024 | 13 |
| Odhran | Boys | 36 | 2020-2025, 6 years | 2022 | 5 |
| Odia | Both, 84% girls | 44 | 1905-1974, 6 years | 1920 | under 5 |
| Odice | Boys | 5 | 1941, 1 year | 1941 | under 5 |
| Odie | Both, 38% girls | 4,212 | 1880-2025, 124 years | 1916 | 17 |
| Odies | Boys | 198 | 1910-1961, 26 years | 1922 | under 5 |
| Odila | Girls | 5 | 1981, 1 year | 1981 | under 5 |
| Odile | Girls | 788 | 1882-2018, 64 years | 1915 | under 5 |
| Odilia | Girls | 1,268 | 1915-2025, 94 years | 1922 | 16 |
| Odilon | Boys | 132 | 1925-2024, 23 years | 1988 | under 5 |
| Odin | Boys | 13,282 | 1884-2025, 81 years | 2022 | 604 |
| Odina | Girls | 10 | 2018-2021, 2 years | 2018 | under 5 |
| Odinn | Boys | 119 | 2012-2025, 13 years | 2019 | 10 |
| Odis | Boys | 8,400 | 1884-2025, 138 years | 1927 | 15 |
| Odom | Boys | 37 | 1915-1931, 6 years | 1917 | under 5 |
| Odon | Boys | 17 | 1916-2007, 3 years | 1916 | under 5 |
| Odonis | Boys | 22 | 2019-2025, 3 years | 2024 | 5 |
| Odos | Boys | 6 | 1920, 1 year | 1920 | under 5 |
| Odra | Girls | 5 | 1907, 1 year | 1907 | under 5 |
| Odrit | Boys | 6 | 2025, 1 year | 2025 | 6 |
| Odus | Boys | 596 | 1895-1979, 54 years | 1918 | under 5 |
| Ody | Both, 29% girls | 17 | 1961-1987, 3 years | 1984 | under 5 |
| Odyn | Boys | 327 | 2008-2025, 15 years | 2018 | 20 |
| Odynn | Boys | 6 | 2018, 1 year | 2018 | under 5 |
| Odysseas | Boys | 6 | 2022, 1 year | 2022 | under 5 |
| Odysseus | Boys | 526 | 1999-2025, 24 years | 2025 | 44 |
| Odyssey | Girls | 775 | 1982-2025, 43 years | 2022 | 35 |
| Oel | Boys | 5 | 1984, 1 year | 1984 | under 5 |
| Oella | Girls | 5 | 1921, 1 year | 1921 | under 5 |
| Oen | Boys | 10 | 2008-2019, 2 years | 2008 | under 5 |
| Oesha | Girls | 5 | 1996, 1 year | 1996 | under 5 |
| Ofa | Girls | 60 | 1922-2023, 9 years | 2005 | under 5 |
| Ofek | Boys | 17 | 2003-2007, 3 years | 2005 | under 5 |
| Ofelia | Girls | 8,997 | 1900-2025, 123 years | 1929 | 87 |
| Offie | Both, 32% girls | 223 | 1896-1957, 27 years | 1916 | under 5 |
| Offranel | Boys | 5 | 2025, 1 year | 2025 | 5 |
| Ofilia | Girls | 472 | 1912-1987, 49 years | 1929 | under 5 |
| Ofir | Boys | 51 | 1991-2014, 8 years | 2004 | under 5 |
| Ofri | Girls | 6 | 2013, 1 year | 2013 | under 5 |
| Ogden | Boys | 810 | 1892-2025, 76 years | 1917 | 9 |
| Ogechi | Girls | 296 | 1980-2025, 36 years | 1997 | 7 |
| Ogechukwu | Both, 89% girls | 57 | 1994-2015, 9 years | 2000 | under 5 |
| Oghenebrume | Boys | 5 | 2018, 1 year | 2018 | under 5 |
| Oghenemine | Girls | 5 | 2015, 1 year | 2015 | under 5 |
| Ogheneruno | Both, 21% girls | 29 | 2012-2017, 4 years | 2017 | under 5 |
| Ogheneruona | Girls | 5 | 2016, 1 year | 2016 | under 5 |
| Oghenetega | Boys | 27 | 2004-2023, 5 years | 2017 | under 5 |
| Oghosa | Girls | 5 | 2013, 1 year | 2013 | under 5 |
| Ogie | Both, 29% girls | 21 | 1919-1926, 4 years | 1919 | under 5 |
| Ogle | Boys | 123 | 1904-1954, 16 years | 1920 | under 5 |
| Ogochukwu | Girls | 5 | 1995, 1 year | 1995 | under 5 |
| Ogreta | Girls | 5 | 1918, 1 year | 1918 | under 5 |
| Oguz | Boys | 10 | 2002-2016, 2 years | 2002 | under 5 |
| Oguzhan | Boys | 5 | 2022, 1 year | 2022 | under 5 |
| Oh | Boys | 5 | 2013, 1 year | 2013 | under 5 |
| Ohad | Boys | 15 | 1991-2005, 3 years | 1991 | under 5 |
| Ohagi | Boys | 7 | 1996, 1 year | 1996 | under 5 |
| Ohajee | Boys | 6 | 1996, 1 year | 1996 | under 5 |
| Ohaji | Boys | 51 | 1996-2025, 7 years | 2021 | 6 |
| Ohan | Boys | 5 | 2007, 1 year | 2007 | under 5 |
| Ohana | Girls | 502 | 2003-2025, 20 years | 2023 | 40 |
| Ohani | Boys | 6 | 2006, 1 year | 2006 | under 5 |
| Ohanna | Girls | 164 | 2004-2025, 18 years | 2021 | 8 |
| Ohara | Both, 77% girls | 26 | 1953-2009, 5 years | 1953 | under 5 |
| Ohemaa | Girls | 135 | 2006-2025, 12 years | 2024 | 13 |
| Ohene | Boys | 62 | 2003-2025, 10 years | 2025 | 11 |
| Oheneba | Boys | 23 | 2017-2024, 3 years | 2021 | under 5 |
| Ohitika | Boys | 5 | 2007, 1 year | 2007 | under 5 |
| Ohlen | Boys | 5 | 2022, 1 year | 2022 | under 5 |
| Ohlin | Boys | 5 | 2006, 1 year | 2006 | under 5 |
| Ohm | Boys | 191 | 2001-2024, 16 years | 2003 | under 5 |
| Ohmer | Boys | 13 | 1914-1931, 2 years | 1931 | under 5 |
| Ohn | Boys | 162 | 1922-1988, 21 years | 1984 | under 5 |
| Ohtani | Boys | 19 | 2024-2025, 2 years | 2024 | 9 |
| Ohtli | Boys | 15 | 2021-2022, 2 years | 2022 | under 5 |
| Oisha | Girls | 13 | 2022-2024, 2 years | 2024 | under 5 |
| Oisin | Boys | 513 | 1991-2025, 31 years | 2020 | 22 |
| Oiva | Boys | 104 | 1913-1924, 11 years | 1916 | under 5 |
| Ojani | Boys | 102 | 1998-2011, 12 years | 2004 | under 5 |
| Ojany | Boys | 11 | 1999-2004, 2 years | 2004 | under 5 |
| Ojas | Boys | 646 | 1999-2025, 26 years | 2025 | 46 |
| Ojasvi | Girls | 42 | 2011-2025, 7 years | 2019 | 6 |
| Ojaswi | Girls | 5 | 2017, 1 year | 2017 | under 5 |
| Ojay | Boys | 19 | 1976-1978, 3 years | 1976 | under 5 |
| Ojetta | Girls | 6 | 1951, 1 year | 1951 | under 5 |
| Oji | Boys | 29 | 1972-1979, 5 years | 1978 | under 5 |
| Ok | Girls | 35 | 1936-1955, 7 years | 1936 | under 5 |
| Oka | Girls | 16 | 1915-1925, 3 years | 1915 | under 5 |
| Okairy | Girls | 5 | 2008, 1 year | 2008 | under 5 |
| Okal | Girls | 6 | 1915, 1 year | 1915 | under 5 |
| Okalani | Girls | 50 | 2009-2025, 8 years | 2017 | 5 |
| Okan | Boys | 11 | 2009-2010, 2 years | 2009 | under 5 |
| Okechukwu | Boys | 100 | 1979-2012, 17 years | 1995 | under 5 |
| Okeema | Girls | 5 | 1975, 1 year | 1975 | under 5 |
| Okeima | Girls | 5 | 1975, 1 year | 1975 | under 5 |
| Okeith | Boys | 12 | 1972-1984, 2 years | 1984 | under 5 |
| Okema | Girls | 71 | 1973-1979, 5 years | 1975 | under 5 |
| Okemia | Girls | 9 | 1975, 1 year | 1975 | under 5 |
| Okey | Boys | 1,462 | 1881-1995, 96 years | 1925 | under 5 |
| Okie | Both, 59% girls | 305 | 1892-1967, 31 years | 1920 | under 5 |
| Okima | Girls | 27 | 1975-1979, 3 years | 1975 | under 5 |
| Okla | Girls | 254 | 1895-1930, 26 years | 1916 | under 5 |
| Oklahoma | Girls | 5 | 1907, 1 year | 1907 | under 5 |
| Okley | Boys | 129 | 1915-1957, 14 years | 1922 | under 5 |
| Okoye | Boys | 51 | 1990-1995, 5 years | 1991 | under 5 |
| Okpara | Boys | 5 | 1979, 1 year | 1979 | under 5 |
| Oksana | Girls | 1,055 | 1950-2025, 59 years | 1995 | 15 |
| Oksanna | Girls | 12 | 1995-1999, 2 years | 1995 | under 5 |
| Oktavia | Girls | 27 | 2017-2023, 5 years | 2020 | under 5 |
| Oktober | Girls | 91 | 2007-2023, 12 years | 2012 | under 5 |
| Ola | Girls | 30,275 | 1880-2025, 146 years | 1920 | 13 |
| Olabisi | Girls | 5 | 1996, 1 year | 1996 | under 5 |
| Olabode | Boys | 5 | 1985, 1 year | 1985 | under 5 |
| Olachi | Girls | 33 | 2008-2025, 6 years | 2008 | 5 |
| Oladapo | Boys | 11 | 1991-1998, 2 years | 1991 | under 5 |
| Oladayo | Boys | 6 | 2023, 1 year | 2023 | under 5 |
| Oladeji | Boys | 5 | 2019, 1 year | 2019 | under 5 |
| Oladele | Boys | 5 | 1990, 1 year | 1990 | under 5 |
Order: alphabetical by the name as SSA spells it. Given to: the share of girls among all babies given the name.