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