Jac is a rare variant of Jack that peaked in 1956 and remains in steady use.
Jac is a boy name. In 2025 it ranked #5,967 for boy births in the United States (and #12,550 across all names), given to 15 babies. Jac first appears in 1915 and peaked in 1956 (18 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 15 | 15 | #5,967 |
| 2024 | 11 | 11 | #7,455 |
| 2023 | 17 | 17 | #5,548 |
| 2022 | 18 | 18 | #5,293 |
| 2020 | 8 | 8 | #9,049 |
| 2019 | 10 | 10 | #7,862 |
| 2018 | 10 | 10 | #7,829 |
| 2017 | 13 | 13 | #6,461 |
| 2016 | 16 | 16 | #5,651 |
| 2015 | 8 | 8 | #9,073 |
| 2014 | 7 | 7 | #10,057 |
| 2013 | 15 | 15 | #5,769 |
| 2012 | 7 | 7 | #10,134 |
| 2011 | 9 | 9 | #8,333 |
| 2010 | 6 | 6 | #11,282 |
| 2009 | 11 | 11 | #7,407 |
| 2008 | 15 | 15 | #5,889 |
| 2007 | 8 | 8 | #9,225 |
| 2006 | 9 | 9 | #8,284 |
| 2005 | 12 | 12 | #6,373 |
| 2004 | 9 | 9 | #7,781 |
| 2003 | 5 | 5 | #11,584 |
| 2002 | 8 | 8 | #7,950 |
| 2001 | 12 | 12 | #5,807 |
| 2000 | 9 | 9 | #7,052 |
| 1999 | 5 | 5 | #10,561 |
| 1998 | 11 | 11 | #5,617 |
| 1997 | 8 | — | #6,860 |
| 1990 | 5 | — | #8,657 |
| 1984 | 5 | — | #6,742 |
| 1978 | 5 | — | #6,203 |
| 1973 | 6 | — | #4,755 |
| 1972 | 6 | — | #4,669 |
| 1970 | 6 | — | #4,462 |
| 1969 | 6 | — | #4,142 |
| 1968 | 10 | — | #2,819 |
| 1967 | 6 | — | #3,732 |
| 1966 | 6 | — | #3,701 |
| 1965 | 10 | — | #2,683 |
| 1963 | 10 | — | #2,754 |
| 1962 | 9 | — | #2,935 |
| 1961 | 10 | — | #2,788 |
| 1960 | 10 | — | #2,761 |
| 1959 | 15 | — | #2,155 |
| 1958 | 11 | — | #2,572 |
| 1957 | 7 | — | #3,387 |
| 1956 | 18 | — | #1,910 |
| 1955 | 11 | — | #2,490 |
| 1954 | 8 | — | #3,054 |
| 1953 | 9 | — | #2,800 |
| 1952 | 17 | — | #1,897 |
| 1951 | 13 | — | #2,190 |
| 1950 | 8 | — | #2,888 |
| 1949 | 8 | — | #2,893 |
| 1946 | 5 | — | #3,754 |
| 1944 | 5 | — | #3,654 |
| 1942 | 10 | — | #2,453 |
| 1940 | 5 | — | #3,690 |
| 1939 | 7 | — | #2,970 |
| 1938 | 5 | — | #3,767 |
| 1934 | 10 | — | #2,473 |
| 1929 | 6 | — | #3,748 |
| 1928 | 9 | — | #2,947 |
| 1927 | 9 | — | #3,022 |
| 1923 | 6 | — | #4,021 |
| 1919 | 6 | — | #3,936 |
| 1915 | 5 | — | #4,093 |