Willo
Willo was given to 9 girls in 2025, #10,867 among girls’ names; 637 Americans have been recorded with it since 1911 (Social Security Administration, published May 2026).
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Willo by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
How popular is Willo?
#10,867 among girls’ names, 2025
Willo rose from #11,789 in 2015 to #10,867 in 2025 among girls’ names; its share of girls born rose from 5.0 to 5.6 per million.
23 babies in 1924, the peak
Willo peaked in 1924, when 23 girls were given it, #1,870 among girls’ names. The 9 births of 2025 are 39% of that peak.
| Year | Births | Rank | Per million girls |
|---|---|---|---|
| 2025 | 9 | #10,867 | 5.6 |
| 2023 | 8 | #12,122 | 5.0 |
| 2022 | 6 | #15,189 | 3.7 |
| 2021 | 11 | #9,510 | 6.7 |
| 2020 | 5 | #17,381 | 3.1 |
| 2018 | 13 | #8,579 | 7.6 |
| 2017 | 8 | #12,659 | 4.6 |
| 2016 | 13 | #8,847 | 7.3 |
| 2015 | 9 | #11,789 | 5.0 |
| 2014 | 6 | #16,402 | 3.4 |
Every recorded year (61)
| Year | Births | Rank | Per million girls |
|---|---|---|---|
| 2013 | 9 | #11,908 | 5.1 |
| 2012 | 9 | #12,154 | 5.1 |
| 2011 | 7 | #14,745 | 4.0 |
| 2009 | 7 | #15,158 | 3.8 |
| 2008 | 5 | #20,331 | 2.6 |
| 2007 | 9 | #12,620 | 4.7 |
| 2004 | 5 | #18,705 | 2.7 |
| 2003 | 6 | #15,692 | 3.3 |
| 2001 | 6 | #15,278 | 3.3 |
| 1963 | 7 | #5,883 | 3.6 |
| 1958 | 8 | #4,883 | 4.0 |
| 1954 | 6 | #5,740 | 3.1 |
| 1953 | 6 | #5,661 | 3.2 |
| 1952 | 5 | #6,380 | 2.7 |
| 1950 | 5 | #6,093 | 2.9 |
| 1949 | 7 | #4,659 | 4.1 |
| 1948 | 7 | #4,641 | 4.1 |
| 1947 | 10 | #3,697 | 5.6 |
| 1946 | 8 | #3,988 | 5.1 |
| 1943 | 10 | #3,243 | 7.2 |
| 1942 | 11 | #2,982 | 8.1 |
| 1940 | 10 | #2,957 | 8.7 |
| 1939 | 12 | #2,584 | 10.9 |
| 1938 | 19 | #1,872 | 17.2 |
| 1937 | 9 | #3,142 | 8.5 |
| 1936 | 15 | #2,150 | 14.4 |
| 1935 | 15 | #2,202 | 14.3 |
| 1934 | 21 | #1,696 | 20.1 |
| 1933 | 14 | #2,270 | 13.9 |
| 1932 | 23 | #1,633 | 21.6 |
| 1931 | 17 | #2,022 | 16.0 |
| 1930 | 21 | #1,812 | 18.7 |
| 1929 | 16 | #2,183 | 14.3 |
| 1928 | 16 | #2,280 | 13.9 |
| 1927 | 15 | #2,428 | 12.6 |
| 1926 | 14 | #2,565 | 11.8 |
| 1925 | 13 | #2,771 | 10.7 |
| 1924 | 23 | #1,870 | 18.4 |
| 1923 | 6 | #4,954 | 5.0 |
| 1922 | 13 | #2,775 | 10.8 |
| 1921 | 19 | #2,115 | 15.4 |
| 1920 | 12 | #2,895 | 10.0 |
| 1919 | 5 | #5,543 | 4.4 |
| 1918 | 9 | #3,505 | 7.8 |
| 1917 | 15 | #2,308 | 13.9 |
| 1916 | 8 | #3,542 | 7.7 |
| 1915 | 8 | #3,424 | 8.1 |
| 1914 | 10 | #2,428 | 13.1 |
| 1913 | 5 | #3,694 | 8.0 |
| 1912 | 6 | #2,967 | 10.8 |
| 1911 | 7 | #2,187 | 16.7 |
Ranks and shares: girls’ names in each year’s SSA file; share of all girls SSA recorded that year.
Is Willo a boy’s or a girl’s name?
Willo has been recorded only for girls: SSA lists no boys with the name in 61 years of records (it lists a name only in years with 5 or more babies of a sex).
Girls and boys named Willo: the SSA national file counts each sex separately.
How many people are named Willo, and how old are they?
An estimated 252 Americans named Willo and born in the U.S. are alive in 2026 (40% of everyone recorded); the median is 19 years old and half are between 10 and 79. An estimate from SSA’s births and life tables, not a count.
The 2020 Census counted 360 people named Willo (310 women and girls, 50 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 272 born in the U.S. The Census count is 32% above that prediction. Possible reasons: the Census records the name people give, which for many is the short form Willo rather than the name on their birth record, and it counts people born abroad, whom SSA’s files leave out.
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).
Names spelled alike
Of these 6 names spelled alike, given to 37,857 babies since 1880, Willo is the third most given (1.7% of them). In 2025 it was given to 9 of their 758 babies (1.2%), the second most given that year.
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 Willo
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 Willo and names like it
- Compare Willo and WillaBirths, ranks, peak and the living estimate side by side.
- The most given names of the 1920sWillo peaked in 1924.
- Alabama’s most given namesThe state where SSA recorded the most babies named Willo since 1910.
- The top names of 1924The year the most babies were named Willo.
- The names of Generation AlphaMost people named Willo alive today were born 2013-2025.
- Names starting with WMost given first.