Koji is a rare boys' name that has climbed to its highest level yet, peaking in 2025.
Koji is a boy name. In 2025 it ranked #3,412 for boy births in the United States (and #7,351 across all names), given to 34 babies. Koji first appears in 1922 and peaked in 2025 (34 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 34 | 34 | #3,412 |
| 2024 | 25 | 25 | #4,274 |
| 2023 | 33 | 33 | #3,516 |
| 2022 | 26 | 26 | #4,147 |
| 2021 | 19 | 19 | #5,034 |
| 2020 | 12 | 12 | #6,850 |
| 2019 | 15 | 15 | #5,980 |
| 2018 | 14 | 14 | #6,190 |
| 2017 | 13 | 13 | #6,519 |
| 2016 | 28 | 28 | #3,844 |
| 2015 | 17 | 17 | #5,416 |
| 2014 | 15 | 15 | #5,884 |
| 2013 | 18 | 18 | #5,085 |
| 2012 | 14 | 14 | #6,183 |
| 2011 | 14 | 14 | #6,119 |
| 2010 | 21 | 21 | #4,614 |
| 2009 | 15 | 15 | #5,969 |
| 2008 | 21 | 21 | #4,639 |
| 2007 | 17 | 17 | #5,333 |
| 2006 | 11 | 11 | #7,218 |
| 2005 | 18 | 18 | #4,745 |
| 2004 | 13 | 13 | #6,000 |
| 2003 | 14 | 14 | #5,426 |
| 2002 | 13 | 13 | #5,584 |
| 2001 | 10 | 10 | #6,736 |
| 2000 | 14 | 14 | #5,200 |
| 1999 | 7 | 7 | #8,347 |
| 1998 | 9 | 9 | #6,602 |
| 1996 | 7 | — | #7,598 |
| 1995 | 13 | — | #4,673 |
| 1994 | 5 | — | #9,628 |
| 1992 | 14 | — | #4,233 |
| 1991 | 8 | — | #6,257 |
| 1990 | 10 | — | #5,211 |
| 1989 | 6 | — | #7,481 |
| 1988 | 6 | — | #6,885 |
| 1986 | 7 | — | #5,684 |
| 1985 | 6 | — | #6,194 |
| 1984 | 18 | — | #2,656 |
| 1983 | 12 | — | #3,537 |
| 1982 | 5 | — | #6,911 |
| 1980 | 5 | — | #6,800 |
| 1975 | 6 | — | #5,149 |
| 1974 | 7 | — | #4,415 |
| 1973 | 5 | — | #5,511 |
| 1972 | 9 | — | #3,495 |
| 1926 | 6 | — | #3,978 |
| 1925 | 5 | — | #4,593 |
| 1922 | 5 | — | #4,662 |