Kolby
A respelling of Colby, an English surname from northern place names combining the Old Norse personal name Kolli with byr, meaning 'farm' or 'settlement'.
Kolby in 2025
Kolby was given to 207 babies in the United States in 2025 — 165 boys and 42 girls, making it the 2,163rd most popular name of the year. That is roughly one in every 16,016 babies born.
The history of Kolby
Kolby reached its highest point in 2001, when 781 babies were given the name, ranking 725th that year.
Across the 58 years of records since 1968, 13,001 babies have been named Kolby. Half of them were born before 2004, which places the name's centre of gravity with Generation Z.
Kolby by decade
| Decade | Babies named Kolby | Best rank |
|---|---|---|
| 1960s | 5 | 10,921 |
| 1970s | 167 | 4,439 |
| 1980s | 843 | 1,902 |
| 1990s | 2,870 | 1,030 |
| 2000s | 5,054 | 725 |
| 2010s | 2,893 | 1,381 |
| 2020s | 1,169 | 2,150 |
Where Kolby is heading
Kolby has fallen 33% over the past decade, from 307 babies in 2015 to 207 in 2025.
Names like Kolby
Names that rose and fell at the same time as Kolby.