Kou
Recorded 1979–2017 · United States
Kou was most popular in 1992, when 53 American babies were given the name — ranking #3,965 that year. It was not recorded in 2025. Across 1880–2025 the Social Security Administration has recorded 724 people named Kou.
Kou over time
How old is the name Kou?
Kou first appears in Social Security Administration records in 1979, which makes it about 46 years old as a recorded American name. It has been recorded in 32 of the 47 years since. It was last recorded in 2017.
How many people are named Kou?
The Social Security Administration has recorded 724 American births named Kou 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 693 are estimated to be alive today.
How many babies were named Kou in 2025?
Kou was not recorded in 2025. The SSA withholds any name given to fewer than five babies in a year, so fewer than five American babies were given it.
Is Kou getting more or less popular?
Kou is out of use. It averaged 8 births a year a decade ago and has not been recorded in the last five years.
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.
Is Kou a boy’s or a girl’s name?
Across the whole record Kou is a boy’s name — 4.6% of the 724 Americans given it were girls and 95.4% 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.
How old is someone named Kou?
Roughly 693 Americans named Kou are alive today — 96% of everyone ever recorded with the name. The median is 36 years old, and half are between 32 and 41. That is a narrow band: Kou 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.
Where Kou is most concentrated
How much more common the name is in each state than across the country as a whole.
Explore further
See Kou on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org