The baby name Kolby appears in baby name data for the United States from 1975 to 2024. It was most popular in 2001 with 824 babies given the name.
In the later years of this period, Kolby has become more popular compared with earlier years.
| Year | Count |
|---|---|
| 1975 | 6 |
| 1978 | 5 |
| 1980 | 7 |
| 1982 | 22 |
| 1983 | 11 |
| 1984 | 14 |
| 1985 | 39 |
| 1986 | 31 |
| 1987 | 46 |
| 1988 | 30 |
| 1989 | 68 |
| 1990 | 99 |
| 1991 | 155 |
| 1992 | 161 |
| 1993 | 155 |
| 1994 | 184 |
| 1995 | 6 |
| 1995 | 277 |
| 1996 | 198 |
| 1997 | 221 |
| 1998 | 356 |
| 1999 | 442 |
| 2000 | 410 |
| 2001 | 10 |
| 2001 | 824 |
| 2002 | 6 |
| 2002 | 749 |
| 2003 | 613 |
| 2004 | 544 |
| 2005 | 424 |
| 2006 | 384 |
| 2007 | 358 |
| 2008 | 447 |
| 2009 | 392 |
| 2010 | 381 |
| 2011 | 9 |
| 2011 | 330 |
| 2012 | 301 |
| 2013 | 323 |
| 2014 | 6 |
| 2014 | 318 |
| 2015 | 328 |
| 2016 | 15 |
| 2016 | 276 |
| 2017 | 6 |
| 2017 | 136 |
| 2018 | 172 |
| 2019 | 123 |
| 2020 | 6 |
| 2020 | 166 |
| 2021 | 121 |
| 2022 | 7 |
| 2022 | 126 |
| 2023 | 7 |
| 2023 | 117 |
| 2024 | 114 |