Koy
Koy was the 5319th most popular name for boys in 2025, given to 18 babies. Its best year was 1997, when it ranked 1982nd with 46 babies. Over the last ten years it has moved down 1,484 places. More babies were named Koy in the 2000s than in any other decade.
Meaning Not yet researched how we research meanings
- Rank in 2025
- #5,319 boys, down 1,227 places since 2020
- Babies in 2025
- 18boys
- Girls and boys
- Almost always a boy’s name2021–2025
- Peak year
- 199746 babies
- Total since 1880
- 979babies recorded
Koy popularity since 1880
A few girls are given the name too: 34 since 1981.
| Year | Rank (boys) | Babies (boys) |
|---|---|---|
| 2025 | #5,319 | 18 |
| 2020 | #4,092 | 25 |
| 2010 | #4,455 | 22 |
| 2000 | #3,594 | 23 |
| 1990 | #6,850 | 7 |
| 1980 | — | — |
| 1970 | #4,510 | 6 |
| 1960 | — | — |
| 1950 | — | — |
| 1940 | — | — |
| 1930 | — | — |
| 1920 | — | — |
| 1910 | — | — |
| 1900 | — | — |
| 1890 | — | — |
| 1880 | — | — |
How popular is Koy, counting every spelling?
Koy is a spelling of Coy, a name family that ranked #1,277 for boys in 2025 once every spelling is counted together, compared with #5,319 for Koy on its own. Together these spellings went to 141 boys in 2025.
| Spelling | Babies 2025 | Official rank | Babies 2021–2025 |
|---|---|---|---|
| Coy | 123 | #1,451 | 571 |
| Koy | 18 | #5,319 | 122 |
Spellings count together when they sound the same in American English and are used for the same sex; nicknames and forms that sound different (such as Theo and Theodore) are kept apart. How we group spellings.
How many kids will share the name Koy?
18 of the 3,606,400 babies born in the US in 2025 were named Koy (0.01 per 1,000 births). For a boy named Koy born in 2025, the chance that another child with the same name is in a class of 20 children the same age is under 1 in 50. If every grade liked the name as much as the 2025 babies do, only about one elementary school in 465 (of 430 pupils) would have a child named Koy.
Shares of all registered births (NCHS); classes assumed to be children born the same year. How we estimate this.
How old are people named Koy?
About 900 people born in the US named Koy are alive today, with a median age of 19; half are between 10 and 27. That makes Koy mostly worn by children and young adults.
Babies given the name each year (SSA) times the share of that birth year still alive (SSA life tables). Counts people born in the US only. Method.
Koy by state
How common Koy was among boys born in each state in 2021–2025. In 47 states fewer than five boys a year got the name, too few for SSA to publish, so those states show as zero.
Names with a similar history
These names rose and fell in step with Koy: their share of US boys followed the most similar curve since 1880. If you like Koy, they share its era and feel.
Questions about the name Koy
How popular is the name Koy?
Koy was the 5319th most popular name for boys in 2025, given to 18 babies. Its best year was 1997, when it ranked 1982nd with 46 babies. Over the last ten years it has moved down 1,484 places. More babies were named Koy in the 2000s than in any other decade.
Is Koy a boy or girl name?
In 2021–2025, almost always a boy’s name given the name Koy in the US.
Where is Koy most popular?
In 2021–2025, Koy was most common in South Dakota (0.27 per 1,000 boys), followed by Idaho and Louisiana.