Colby is an established boys' name that peaked in 2001 and has since faded.
Colby is predominantly a boy name. In 2025 it ranked #615 among boys (455) and #2,828 among girls (60) — overall #1,147 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 515 | 515 | #2,828 | #615 |
| 2024 | 539 | 539 | #3,240 | #583 |
| 2023 | 514 | 514 | #3,395 | #607 |
| 2022 | 533 | 533 | #2,703 | #601 |
| 2021 | 476 | 476 | #2,967 | #651 |
| 2020 | 484 | 484 | #3,407 | #618 |
| 2019 | 495 | 495 | #3,290 | #612 |
| 2018 | 501 | 501 | #3,628 | #597 |
| 2017 | 512 | 512 | #3,352 | #584 |
| 2016 | 595 | 595 | #4,013 | #529 |
| 2015 | 710 | 710 | #3,493 | #457 |
| 2014 | 769 | 769 | #3,145 | #427 |
| 2013 | 779 | 779 | #4,351 | #400 |
| 2012 | 957 | 957 | #3,379 | #341 |
| 2011 | 1,083 | 1,083 | #2,996 | #314 |
| 2010 | 1,273 | 1,273 | #2,702 | #280 |
| 2009 | 1,224 | 1,224 | #2,575 | #285 |
| 2008 | 1,326 | 1,326 | #2,638 | #273 |
| 2007 | 1,289 | 1,289 | #2,688 | #283 |
| 2006 | 1,316 | 1,316 | #3,573 | #272 |
| 2005 | 1,657 | 1,657 | #2,975 | #220 |
| 2004 | 2,137 | 2,137 | #2,402 | #185 |
| 2003 | 2,255 | 2,255 | #2,086 | #181 |
| 2002 | 3,237 | 3,237 | #1,565 | #125 |
| 2001 | 3,979 | 3,979 | #1,547 | #99 |
| 2000 | 1,620 | 1,620 | #1,262 | #234 |
| 1999 | 1,645 | 1,645 | #1,311 | #224 |
| 1998 | 1,544 | 1,544 | #1,776 | #220 |
| 1997 | 1,447 | — | #1,721 | #229 |
| 1996 | 1,446 | — | #1,552 | #225 |
| 1995 | 1,519 | — | #1,477 | #209 |
| 1994 | 1,591 | — | #1,230 | #200 |
| 1993 | 1,653 | — | #1,274 | #200 |
| 1992 | 1,729 | — | #1,139 | #197 |
| 1991 | 1,639 | — | #1,328 | #202 |
| 1990 | 1,258 | — | #1,266 | #245 |
| 1989 | 1,137 | — | #1,415 | #250 |
| 1988 | 1,024 | — | #1,385 | #255 |
| 1987 | 1,008 | — | #1,098 | #257 |
| 1986 | 1,016 | — | #1,143 | #253 |
| 1985 | 861 | — | #1,032 | #286 |
| 1984 | 888 | — | #1,083 | #276 |
| 1983 | 738 | — | #1,428 | #300 |
| 1982 | 525 | — | #2,909 | #360 |
| 1981 | 259 | — | #4,379 | #539 |
| 1980 | 293 | — | #2,880 | #532 |
| 1979 | 327 | — | #2,941 | #478 |
| 1978 | 314 | — | #3,118 | #479 |
| 1977 | 339 | — | #2,223 | #467 |
| 1976 | 361 | — | #2,103 | #432 |
| 1975 | 392 | — | #2,065 | #413 |
| 1974 | 370 | — | #2,074 | #436 |
| 1973 | 335 | — | #2,697 | #445 |
| 1972 | 230 | — | #3,076 | #551 |
| 1971 | 228 | — | #3,389 | #560 |
| 1970 | 161 | — | #3,327 | #696 |
| 1969 | 95 | — | #4,227 | #843 |
| 1968 | 84 | — | #4,542 | #845 |
| 1967 | 42 | — | — | #1,152 |
| 1966 | 38 | — | — | #1,219 |
| 1965 | 38 | — | #5,931 | #1,362 |
| 1964 | 35 | — | #6,131 | #1,465 |
| 1963 | 39 | — | #6,006 | #1,356 |
| 1962 | 32 | — | #5,975 | #1,550 |
| 1961 | 41 | — | — | #1,238 |
| 1960 | 32 | — | — | #1,408 |
| 1959 | 34 | — | #6,423 | #1,469 |
| 1958 | 27 | — | #6,259 | #1,691 |
| 1957 | 36 | — | #6,237 | #1,413 |
| 1956 | 33 | — | #6,110 | #1,486 |
| 1955 | 39 | — | #3,117 | #1,546 |
| 1954 | 25 | — | #5,249 | #1,773 |
| 1953 | 26 | — | #3,997 | #1,910 |
| 1952 | 35 | — | #3,857 | #1,489 |
| 1951 | 14 | — | — | #2,068 |
| 1950 | 21 | — | #4,390 | #2,041 |
| 1949 | 24 | — | — | #1,515 |
| 1948 | 25 | — | — | #1,465 |
| 1947 | 17 | — | — | #1,863 |
| 1946 | 8 | — | — | #2,740 |
| 1945 | 15 | — | — | #1,791 |
| 1944 | 16 | — | — | #1,753 |
| 1943 | 10 | — | — | #2,435 |
| 1942 | 9 | — | — | #2,560 |
| 1941 | 7 | — | — | #2,921 |
| 1940 | 6 | — | — | #3,193 |
| 1939 | 9 | — | — | #2,486 |
| 1938 | 10 | — | — | #2,358 |
| 1937 | 7 | — | — | #2,959 |
| 1936 | 7 | — | — | #2,920 |
| 1935 | 10 | — | — | #2,418 |
| 1934 | 6 | — | — | #3,356 |
| 1933 | 6 | — | — | #3,338 |
| 1932 | 5 | — | — | #3,874 |
| 1931 | 5 | — | — | #3,872 |
| 1930 | 8 | — | — | #3,070 |
| 1929 | 5 | — | — | #4,069 |
| 1928 | 9 | — | — | #2,889 |
| 1927 | 10 | — | — | #2,734 |
| 1926 | 8 | — | — | #3,186 |
| 1925 | 8 | — | — | #3,197 |
| 1924 | 9 | — | — | #3,067 |
| 1923 | 7 | — | — | #3,528 |
| 1922 | 8 | — | — | #3,306 |
| 1921 | 13 | — | — | #2,405 |
| 1920 | 13 | — | — | #2,357 |
| 1919 | 8 | — | — | #3,166 |
| 1918 | 7 | — | — | #3,437 |
| 1917 | 9 | — | — | #2,777 |
| 1916 | 8 | — | — | #2,968 |
| 1888 | 5 | — | — | #1,067 |