The baby name Colby appears in baby name data for the United States from 1917 to 2024. It was most popular in 2001 with 4,354 babies given the name.
In the later years of this period, Colby has become more popular compared with earlier years.
| Year | Count |
|---|---|
| 1917 | 5 |
| 1922 | 5 |
| 1944 | 6 |
| 1945 | 6 |
| 1954 | 5 |
| 1960 | 5 |
| 1965 | 20 |
| 1967 | 5 |
| 1968 | 21 |
| 1969 | 20 |
| 1970 | 80 |
| 1971 | 165 |
| 1972 | 126 |
| 1973 | 310 |
| 1974 | 322 |
| 1975 | 297 |
| 1976 | 328 |
| 1977 | 15 |
| 1977 | 264 |
| 1978 | 262 |
| 1979 | 279 |
| 1980 | 222 |
| 1981 | 170 |
| 1982 | 491 |
| 1983 | 29 |
| 1983 | 691 |
| 1984 | 74 |
| 1984 | 802 |
| 1985 | 112 |
| 1985 | 773 |
| 1986 | 100 |
| 1986 | 982 |
| 1987 | 98 |
| 1987 | 934 |
| 1988 | 44 |
| 1988 | 1,025 |
| 1989 | 51 |
| 1989 | 1,146 |
| 1990 | 82 |
| 1990 | 1,195 |
| 1991 | 78 |
| 1991 | 1,609 |
| 1992 | 114 |
| 1992 | 1,967 |
| 1993 | 78 |
| 1993 | 1,862 |
| 1994 | 78 |
| 1994 | 1,830 |
| 1995 | 66 |
| 1995 | 1,726 |
| 1996 | 37 |
| 1996 | 1,576 |
| 1997 | 20 |
| 1997 | 1,643 |
| 1998 | 25 |
| 1998 | 1,738 |
| 1999 | 69 |
| 1999 | 1,759 |
| 2000 | 102 |
| 2000 | 1,639 |
| 2001 | 72 |
| 2001 | 4,354 |
| 2002 | 51 |
| 2002 | 3,629 |
| 2003 | 15 |
| 2003 | 2,525 |
| 2004 | 17 |
| 2004 | 2,405 |
| 2005 | 22 |
| 2005 | 1,987 |
| 2006 | 1,518 |
| 2007 | 22 |
| 2007 | 1,337 |
| 2008 | 10 |
| 2008 | 1,421 |
| 2009 | 1,301 |
| 2010 | 5 |
| 2010 | 1,452 |
| 2011 | 5 |
| 2011 | 1,170 |
| 2012 | 1,109 |
| 2013 | 934 |
| 2014 | 5 |
| 2014 | 863 |
| 2015 | 847 |
| 2016 | 5 |
| 2016 | 751 |
| 2017 | 591 |
| 2018 | 5 |
| 2018 | 574 |
| 2019 | 5 |
| 2019 | 560 |
| 2020 | 17 |
| 2020 | 444 |
| 2021 | 5 |
| 2021 | 502 |
| 2022 | 10 |
| 2022 | 473 |
| 2023 | 492 |
| 2024 | 6 |
| 2024 | 537 |