Ko
Ko was last recorded in 2021, when 6 babies were given it; 85 Americans have been recorded with it between 1985 and 2021 (Social Security Administration, published May 2026).
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Ko by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
How popular is Ko?
Unranked in 2025
Its last boys’ rank on record is #11,529, in 2021; SSA lists a name only in years with 5 or more births.
8 babies in 2016, the peak
Ko peaked in 2016, when 8 boys were given it, #9,323 among boys’ names. It was not recorded in 2025.
Births by sex.
| Year | Girls | Girls’ rank | Boys | Boys’ rank |
|---|---|---|---|---|
| 2021 | under 5 | 6 | #11,529 | |
| 2020 | under 5 | 7 | #10,136 | |
| 2019 | under 5 | 5 | #13,227 | |
| 2016 | under 5 | 8 | #9,323 | |
| 2015 | under 5 | 5 | #13,163 | |
| 2011 | under 5 | 5 | #13,449 | |
| 2010 | under 5 | 5 | #13,402 | |
| 2008 | under 5 | 5 | #13,685 | |
| 1993 | 5 | #14,639 | under 5 | |
| 1992 | under 5 | 5 | #9,192 |
Every recorded year (15)
| Year | Girls | Girls’ rank | Boys | Boys’ rank |
|---|---|---|---|---|
| 1991 | under 5 | 7 | #6,940 | |
| 1990 | under 5 | 7 | #6,836 | |
| 1989 | under 5 | 5 | #8,627 | |
| 1988 | 5 | #12,829 | under 5 | |
| 1985 | under 5 | 5 | #7,102 |
Ranks: girls’ names and boys’ names ranked separately in each year’s SSA file; “under 5” is a year SSA did not list the name for that sex.
Is Ko a boy’s or a girl’s name?
Of the 85 Americans recorded as Ko, 12% are girls and 88% boys.
Years with fewer than 20 babies given the name are left blank.
Girls and boys named Ko: the SSA national file counts each sex separately.
How many people are named Ko, and how old are they?
An estimated 83 Americans named Ko and born in the U.S. are alive in 2026, too few to state an age range. An estimate from SSA’s births and life tables, not a count.
The 2020 Census counted 1,263 people named Ko (369 women and girls, 894 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 73 born in the U.S. The Census count is 17.3 times that prediction. Possible reasons: the Census counts people born abroad, whom SSA’s files leave out, and it records the name people give, which SSA may have recorded under another spelling or as part of a compound name.
Living estimate: SSA births carried forward with the survival rates in SSA’s cohort life tables (2024 Trustees Report) for each birth year and sex. How the estimate is made. Count: Census Bureau, first names in the 2020 Census (released April 14, 2026; names reported 100 or more times, with the Bureau’s disclosure-avoidance adjustment).
Names spelled alike
Spelled alike: names in the SSA national file with the same pattern of letters and sounds and at most two letters apart, and Wiktionary’s listed forms; births since 1880. Some are separate names, not spellings of one.