Recorded 1911–2025 · United States
Willo was most popular in 1924, when 23 American babies were given the name — ranking #3,246 that year. In 2025 it ranked #17,163, with 9 births. Across 1880–2025 the Social Security Administration has recorded 637 people named Willo.
Willo first appears in Social Security Administration records in 1911, which makes it about 114 years old as a recorded American name. It has been recorded in 61 of the 115 years since.
The Social Security Administration has recorded 637 American births named Willo between 1880 and 2025. That is recorded US births, not a world population — it counts people issued a Social Security number at birth in the United States. Of those, roughly 260 are estimated to be alive today.
9 American babies were named Willo in 2025, ranking #17,163 that year.
Willo is too rare for a direction to mean much. It averaged 9 births a year across 2021–2025 against 8 a year a decade earlier — at these counts a single baby moves the percentage, and any year under five births is withheld at source.
Measured on recorded births. American births overall have fallen since 2007, so most established names lose births over any recent decade — a name can shed births and still hold its rank. Compare the rank above, which is measured against the other names of the same year.
Across the whole record Willo is a girl’s name — 100.0% of the 637 Americans given it were girls and 0.0% were boys. In births since 2016 it is 100% girls and 0% boys.
Counted from every US birth the Social Security Administration recorded under this name, so it reflects use rather than opinion. A name given to fewer than five babies of one sex in a year is withheld at source and is not counted.
Roughly 260 Americans named Willo are alive today — 41% of everyone ever recorded with the name. The median is 19 years old, and half are between 10 and 79. That is a wide band, the mark of a name in steady use across generations rather than a passing fashion.
An estimate, not a count. Recorded births are carried forward through the Social Security Administration’s 2023 period life table, by age and sex. That table describes mortality in one recent year, so it credits the oldest cohorts with today’s survival rather than the harsher rates they actually lived through — the further back a name peaked, the more this will overstate how many remain. It counts people issued a Social Security number at birth, not immigrants who arrived later.
See Willo on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org