Recorded 1958–2025 · United States
Koby was most popular in 2000, when 419 American babies were given the name — ranking #1,123 that year. In 2025 it ranked #4,625, with 66 births. Across 1880–2025 the Social Security Administration has recorded 6,135 people named Koby.
Koby first appears in Social Security Administration records in 1958, which makes it about 67 years old as a recorded American name. It has been recorded in 65 of the 68 years since.
The Social Security Administration has recorded 6,135 American births named Koby 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 5,995 are estimated to be alive today.
66 American babies were named Koby in 2025, ranking #4,625 that year.
Koby is falling. Across 2021–2025 it averaged 79 births a year, against 110 a year across 2011–2015 — a change of -28% 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 Koby is a boy’s name — 1.6% of the 6,135 Americans given it were girls and 98.4% were boys. In births since 2016 it is 5% girls and 95% 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 5,995 Americans named Koby are alive today — 98% of everyone ever recorded with the name. The median is 24 years old, and half are between 16 and 28. That is a narrow band: Koby 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 Koby on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org