Kolby Boy
How popular is Kolby?
#1,222 boy name in 2025
165 baby boys were named Kolby in the US in 2025, making it the 1222nd most popular boy name. Another 42 girls got the name (#3,576 for girls).
Kolby popularity over time
Boys Girls
| Rank in 2025 | #1,222 for boys (▲ 40 from 2024) |
|---|---|
| Babies in 2025 | 165 boys, 42 girls |
| 10-year trend | Falling (-39% babies vs 2015) |
| Earlier ranks | #828 in 2015, #1,144 in 2020 |
| Peak year | 2001 (739 boys) |
| Highest rank | #359 in 2001 |
| First recorded | 1968 |
| Boys vs girls (last 10 years) | 84% boys, 16% girls |
| Chance a classmate shares it | 0.1% in a class of 25 kids born in 2025 |
Kolby counting every spelling
Social Security counts each spelling as its own name. Adding together the spellings that sound alike, the Colby family of names ranked #472 for boys in 2025 (#465 the year before), with 626 babies in all.
| Spelling | Boys in 2025 | Share |
|---|---|---|
| Colby | 455 | 73% |
| Kolby | 165 | 26% |
| Kolbey | 6 | 1% |
Spellings are grouped by how they sound, using our own rules, so a few groupings may not match how your family says the name.
Where Kolby is most popular
Babies named Kolby per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
Kolby by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1960s | 5 | #4,135 |
| 1970s | 154 | #2,104 |
| 1980s | 712 | #913 |
| 1990s | 2,531 | #521 |
| 2000s | 4,729 | #359 |
| 2010s | 2,551 | #684 |
| 2020s | 968 | #1,144 |
Boy names about as popular as Kolby
Questions
- Is Kolby a boy or girl name?
- Kolby is mostly a boy name. Over the last 10 years, 84% of babies named Kolby were boys.
- How popular is the name Kolby?
- 165 baby boys were named Kolby in the US in 2025, making it the 1222nd most popular boy name. Another 42 girls got the name (#3,576 for girls).
- When was Kolby most popular?
- Kolby peaked in 2001, when 739 boys were given the name. Its highest rank was #359 in 2001.
- How many people are named Kolby?
- 13,001 babies have been named Kolby in the US since 1880. We estimate about 12,768 of them are alive in 2026, with a median age of 22.
- Where is Kolby most popular?
- From 2021 to 2025, Kolby was most common in Missouri, at 0.2 of every 1,000 boys born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.