Recorded 1971–2025 · United States
Semaj was most popular in 2009, when 495 American babies were given the name — ranking #1,142 that year. In 2025 it ranked #1,990, with 235 births. Across 1880–2025 the Social Security Administration has recorded 9,459 people named Semaj.
Semaj first appears in Social Security Administration records in 1971, which makes it about 54 years old as a recorded American name. It has been recorded in 54 of the 55 years since.
The Social Security Administration has recorded 9,459 American births named Semaj 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 9,331 are estimated to be alive today.
235 American babies were named Semaj in 2025, ranking #1,990 that year.
Semaj is falling. Across 2021–2025 it averaged 230 births a year, against 341 a year across 2011–2015 — a change of -32% 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 Semaj is a unisex name — 21.6% of the 9,459 Americans given it were girls and 78.5% were boys. In births since 2016 it is 16% girls and 84% 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 9,331 Americans named Semaj are alive today — 99% of everyone ever recorded with the name. The median is 17 years old, and half are between 11 and 23. That is a narrow band: Semaj arrived and faded within about a decade rather than staying in steady use.
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 Semaj on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org