Guillermo
Guillermo was given to 264 boys in 2025, #902 among boys’ names; 32,148 Americans have been recorded with it since 1885 (Social Security Administration, published May 2026).
An estimated 27,900 Americans named Guillermo and born in the U.S. are alive in 2026 (87% of everyone recorded); the median is 31 years old and half are between 19 and 45.
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Guillermo by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
What does Guillermo mean?
Wiktionary, Tagalog section
Guillermo is “a male given name from Spanish”
Borrowed from Spanish Guillermo, from Old French Guillaume, from Frankish *Willahelm, from Proto-Germanic *Wiljahelmaz, from *wiljô + *helmaz. Doublet of William.
/ɡilˈjeɾmo/
Meaning: Wiktionary, Tagalog section, as of Sep 25, 2026 (CC BY‑SA 4.0).
How popular is Guillermo?
#902 among boys’ names, 2025
Guillermo fell from #661 in 2015 to #902 in 2025 among boys’ names; its share of boys born fell from 0.20 to 0.15 per 1,000.
693 babies in 1998, the peak
Guillermo peaked in 1998, when 693 boys were given it, #369 among boys’ names. The 264 births of 2025 are 38% of that peak.
| Year | Births | Rank | Per 1,000 boys |
|---|---|---|---|
| 2025 | 264 | #902 | 0.15 |
| 2024 | 299 | #831 | 0.17 |
| 2023 | 294 | #833 | 0.17 |
| 2022 | 287 | #850 | 0.16 |
| 2021 | 299 | #812 | 0.17 |
| 2020 | 275 | #832 | 0.16 |
| 2019 | 320 | #747 | 0.18 |
| 2018 | 314 | #752 | 0.17 |
| 2017 | 289 | #795 | 0.16 |
| 2016 | 322 | #755 | 0.17 |
Every recorded year (125)
| Year | Births | Rank | Per 1,000 boys |
|---|---|---|---|
| 2015 | 389 | #661 | 0.20 |
| 2014 | 376 | #676 | 0.20 |
| 2013 | 348 | #690 | 0.18 |
| 2012 | 392 | #619 | 0.21 |
| 2011 | 408 | #604 | 0.21 |
| 2010 | 457 | #553 | 0.24 |
| 2009 | 534 | #507 | 0.27 |
| 2008 | 583 | #476 | 0.29 |
| 2007 | 610 | #454 | 0.29 |
| 2006 | 621 | #439 | 0.30 |
| 2005 | 616 | #434 | 0.31 |
| 2004 | 639 | #406 | 0.32 |
| 2003 | 595 | #428 | 0.30 |
| 2002 | 626 | #405 | 0.32 |
| 2001 | 620 | #402 | 0.32 |
| 2000 | 651 | #392 | 0.33 |
| 1999 | 665 | #387 | 0.35 |
| 1998 | 693 | #369 | 0.36 |
| 1997 | 632 | #382 | 0.34 |
| 1996 | 692 | #352 | 0.37 |
| 1995 | 623 | #380 | 0.33 |
| 1994 | 675 | #357 | 0.35 |
| 1993 | 654 | #360 | 0.33 |
| 1992 | 659 | #361 | 0.33 |
| 1991 | 582 | #389 | 0.29 |
| 1990 | 587 | #394 | 0.29 |
| 1989 | 532 | #404 | 0.27 |
| 1988 | 511 | #386 | 0.27 |
| 1987 | 388 | #451 | 0.21 |
| 1986 | 405 | #430 | 0.22 |
| 1985 | 432 | #409 | 0.23 |
| 1984 | 412 | #404 | 0.23 |
| 1983 | 423 | #394 | 0.24 |
| 1982 | 437 | #386 | 0.24 |
| 1981 | 428 | #392 | 0.24 |
| 1980 | 395 | #409 | 0.22 |
| 1979 | 394 | #400 | 0.23 |
| 1978 | 322 | #442 | 0.20 |
| 1977 | 351 | #422 | 0.21 |
| 1976 | 360 | #411 | 0.23 |
| 1975 | 349 | #416 | 0.22 |
| 1974 | 349 | #418 | 0.22 |
| 1973 | 347 | #419 | 0.22 |
| 1972 | 281 | #469 | 0.17 |
| 1971 | 314 | #461 | 0.18 |
| 1970 | 290 | #472 | 0.16 |
| 1969 | 244 | #494 | 0.14 |
| 1968 | 292 | #450 | 0.17 |
| 1967 | 242 | #484 | 0.14 |
| 1966 | 194 | #550 | 0.11 |
| 1965 | 203 | #539 | 0.11 |
| 1964 | 192 | #571 | 0.10 |
| 1963 | 193 | #567 | 0.10 |
| 1962 | 185 | #576 | 0.09 |
| 1961 | 171 | #607 | 0.08 |
| 1960 | 191 | #564 | 0.09 |
| 1959 | 184 | #579 | 0.09 |
| 1958 | 162 | #602 | 0.08 |
| 1957 | 158 | #611 | 0.07 |
| 1956 | 172 | #580 | 0.08 |
| 1955 | 150 | #603 | 0.07 |
| 1954 | 149 | #607 | 0.07 |
| 1953 | 126 | #637 | 0.06 |
| 1952 | 134 | #609 | 0.07 |
| 1951 | 133 | #610 | 0.07 |
| 1950 | 127 | #607 | 0.07 |
| 1949 | 137 | #576 | 0.08 |
| 1948 | 136 | #573 | 0.08 |
| 1947 | 114 | #646 | 0.06 |
| 1946 | 93 | #671 | 0.06 |
| 1945 | 94 | #626 | 0.07 |
| 1944 | 77 | #708 | 0.06 |
| 1943 | 79 | #726 | 0.06 |
| 1942 | 53 | #914 | 0.04 |
| 1941 | 89 | #646 | 0.07 |
| 1940 | 71 | #726 | 0.06 |
| 1939 | 63 | #765 | 0.06 |
| 1938 | 70 | #731 | 0.06 |
| 1937 | 67 | #746 | 0.06 |
| 1936 | 79 | #663 | 0.08 |
| 1935 | 72 | #720 | 0.07 |
| 1934 | 86 | #651 | 0.08 |
| 1933 | 74 | #699 | 0.07 |
| 1932 | 71 | #742 | 0.07 |
| 1931 | 100 | #586 | 0.10 |
| 1930 | 101 | #611 | 0.09 |
| 1929 | 94 | #630 | 0.09 |
| 1928 | 87 | #677 | 0.08 |
| 1927 | 100 | #632 | 0.09 |
| 1926 | 107 | #606 | 0.10 |
| 1925 | 88 | #688 | 0.08 |
| 1924 | 87 | #708 | 0.08 |
| 1923 | 89 | #684 | 0.08 |
| 1922 | 57 | #924 | 0.05 |
| 1921 | 44 | #1,060 | 0.04 |
| 1920 | 68 | #813 | 0.06 |
| 1919 | 43 | #1,041 | 0.04 |
| 1918 | 34 | #1,202 | 0.03 |
| 1917 | 40 | #1,049 | 0.04 |
| 1916 | 20 | #1,613 | 0.02 |
| 1915 | 33 | #1,132 | 0.04 |
| 1914 | 26 | #1,143 | 0.04 |
| 1913 | 16 | #1,336 | 0.03 |
| 1912 | 18 | #1,115 | 0.04 |
| 1911 | 10 | #1,146 | 0.04 |
| 1910 | 13 | #895 | 0.07 |
| 1909 | 5 | #1,553 | 0.03 |
| 1908 | 7 | #1,148 | 0.05 |
| 1907 | 6 | #1,256 | 0.04 |
| 1905 | 10 | #812 | 0.08 |
| 1904 | 10 | #780 | 0.08 |
| 1900 | 6 | #1,224 | 0.04 |
| 1897 | 5 | #1,131 | 0.04 |
| 1892 | 8 | #824 | 0.07 |
| 1885 | 5 | #1,001 | 0.05 |
Ranks and shares: boys’ names in each year’s SSA file; share of all boys SSA recorded that year.
Is Guillermo a boy’s or a girl’s name?
Guillermo has been given almost only to boys: 74 girls in 125 years of records.
Girls and boys named Guillermo: the SSA national file counts each sex separately.
How many people are named Guillermo, and how old are they?
27,900 alive in 2026, estimated
That is 87% of the 32,148 Americans ever recorded as Guillermo. The median Guillermo alive today is 31 years old; half are between 19 and 45.
The 2020 Census counted 61,844 people named Guillermo (131 women and girls, 61,713 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 27,115 born in the U.S. The Census count is 2.3 times that prediction. Possible reasons: the Census counts people born abroad, whom SSA’s files leave out, and it records the name people give, which SSA may have recorded under another spelling or as part of a compound name.
Alive today, by age
Alive today, by generation
| Generation | Born | Alive |
|---|---|---|
| Silent Generation | 1928-1945 | 265 |
| Baby Boomers | 1946-1964 | 1,970 |
| Generation X | 1965-1980 | 4,390 |
| Millennials | 1981-1996 | 8,090 |
| Generation Z | 1997-2012 | 9,190 |
| Generation Alpha | 2013-2025 | 4,050 |
An estimate, not a count. SSA’s files count people born in the United States who received a Social Security number, so anyone born abroad is not in them; before 1937 most people got a number as adults, and their survival is counted from that age.
Living estimate: SSA births carried forward with the survival rates in SSA’s cohort life tables (2024 Trustees Report) for each birth year and sex. How the estimate is made. Count: Census Bureau, first names in the 2020 Census (released April 14, 2026; names reported 100 or more times, with the Bureau’s disclosure-avoidance adjustment).
Where are babies named Guillermo born?
The states with the most babies named Guillermo are Texas, California and Arizona, with 68% of its births recorded by state in 2025; Arizona is not among the ten states with the most births.
| State | Births 2025 | Rank, boys | vs. national |
|---|---|---|---|
| Texas | 64 | #521 | 3.3× |
| California | 60 | #511 | 2.9× |
| Arizona | 17 | #436 | 2.7× |
| Florida | 11 | #1,147 | 1.0× |
| Washington | 10 | #657 | 0.5× |
| Illinois | 9 | #892 | 0.9× |
| New York | 8 | #1,344 | 0.7× |
| Colorado | 6 | #797 | 0.6× |
| North Carolina | 6 | #1,190 | 0.3× |
| Minnesota | 6 | #742 | 0.0× |
Where Guillermo is more common than its national share predicts
Relative to its national share, Guillermo is most over-represented in Texas: since 1910 it was given 3.3 times as often there as its national share each year would predict.
States: SSA state file, 1910-2025, published May 8, 2026; births count girls and boys together, and the rank is among boys’ names in the state in 2025. The file leaves out any state and year with fewer than 5 babies of the name, so small states are undercounted; each ratio compares the state’s births of Guillermo with the births its national share predicts year by year, for states with at least 100 births of the name.
Names spelled alike
Of these 2 names spelled alike, given to 32,670 babies since 1880, Guillermo is the most given (98% of them). In 2025 it was given to 264 of their 272 babies (97%), again the most given.
Spelled alike: names in the SSA national file with the same pattern of letters and sounds and at most two letters apart, and Wiktionary’s listed forms; births since 1880 and in 2025, and each name’s peak year, from the SSA national file, published May 8, 2026. Some are separate names, not spellings of one.
Names that rose and fell in the same decades as Guillermo
Names whose births rose and fell across the same decades, measured on each decade’s share of births.
Similar histories: each decade’s share of births, from the SSA national file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
More about Guillermo and names like it
- Compare Guillermo and GuilhermeBirths, ranks, peak and the living estimate side by side.
- The most given names of the 1990sGuillermo peaked in 1998.
- California’s most given namesThe state where SSA recorded the most babies named Guillermo since 1910.
- Spanish namesWiktionary’s origin for Guillermo: every such name, by how often it is given.
- The top names of 1998The year the most babies were named Guillermo.
- The names of Generation ZMost people named Guillermo alive today were born 1997-2012.
- Names starting with GMost given first.