Recorded 1957–2025 · United States
Zac was most popular in 2014, when 84 American babies were given the name — ranking #3,959 that year. In 2025 it ranked #6,835, with 37 births. Across 1880–2025 the Social Security Administration has recorded 1,600 people named Zac.
Zac first appears in Social Security Administration records in 1957, which makes it about 68 years old as a recorded American name. It has been recorded in 59 of the 69 years since.
The Social Security Administration has recorded 1,600 American births named Zac 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 1,565 are estimated to be alive today.
37 American babies were named Zac in 2025, ranking #6,835 that year.
Zac is falling. Across 2021–2025 it averaged 44 births a year, against 72 a year across 2011–2015 — a change of -39% over the decade.
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 Zac is a boy’s name — 0.0% of the 1,600 Americans given it were girls and 100.0% were boys. In births since 2016 it is 0% girls and 100% 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 1,565 Americans named Zac are alive today — 98% of everyone ever recorded with the name. The median is 14 years old, and half are between 9 and 22.
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.
How much more common the name is in each state than across the country as a whole.
See Zac on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org