Compare two names
Colby and Kolby side by side: Colby peaked in 2001 and Kolby in 2001; in 2025 they were given to 515 and 207 babies.
Colby and Kolby, year by year
Girls and boys together; Colby solid, Kolby dashed.
| Colby | Kolby | |
|---|---|---|
| Births 2025 | 515 | 207 |
| Rank 2025 | #615 among boys’ names | #1,225 among boys’ names |
| Recorded since 1880 | 58,155 | 13,001 |
| Peak year | 2001 | 2001 |
| Girls | 7% | 10% |
| Alive, estimated | 56,100 | 12,700 |
| Median age | 25 | 22 |
Both names: SSA national file, published May 8, 2026, and SSA’s cohort life tables.