Rainier is a rare boys' name that peaked in 2023 and remains in steady use.
Rainier is predominantly a boy name. In 2025 it ranked #3,362 for boy births in the United States (and #7,233 across all names), given to 35 babies. Rainier first appears in 1956 and peaked in 2023 (41 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 35 | 35 | — | #3,362 |
| 2024 | 27 | 27 | — | #4,050 |
| 2023 | 51 | 51 | #10,161 | #3,049 |
| 2022 | 45 | 45 | #17,217 | #3,091 |
| 2021 | 46 | 46 | #14,864 | #3,064 |
| 2020 | 34 | 34 | — | #3,329 |
| 2019 | 41 | 41 | #9,606 | #3,696 |
| 2018 | 38 | 38 | #15,233 | #3,501 |
| 2017 | 24 | 24 | — | #4,306 |
| 2016 | 30 | 30 | — | #3,661 |
| 2015 | 43 | 43 | #12,746 | #3,288 |
| 2014 | 20 | 20 | — | #4,821 |
| 2013 | 23 | 23 | — | #4,279 |
| 2012 | 26 | 26 | — | #3,976 |
| 2011 | 17 | 17 | — | #5,375 |
| 2010 | 20 | 20 | — | #4,801 |
| 2009 | 8 | 8 | — | #9,664 |
| 2008 | 18 | 18 | — | #5,208 |
| 2007 | 14 | 14 | — | #6,191 |
| 2006 | 16 | 16 | — | #5,471 |
| 2005 | 15 | 15 | — | #5,513 |
| 2004 | 15 | 15 | — | #5,430 |
| 2003 | 14 | 14 | — | #5,484 |
| 2002 | 7 | 7 | — | #9,159 |
| 2001 | 9 | 9 | — | #7,378 |
| 2000 | 10 | 10 | — | #6,712 |
| 1999 | 5 | 5 | — | #11,205 |
| 1998 | 11 | 11 | — | #5,748 |
| 1997 | 11 | — | — | #5,568 |
| 1996 | 9 | — | — | #6,372 |
| 1995 | 11 | — | — | #5,418 |
| 1994 | 9 | — | — | #6,228 |
| 1993 | 12 | — | — | #4,930 |
| 1992 | 10 | — | — | #5,558 |
| 1991 | 9 | — | — | #5,829 |
| 1990 | 8 | — | — | #6,274 |
| 1989 | 11 | — | — | #4,745 |
| 1988 | 5 | — | — | #8,222 |
| 1987 | 12 | — | — | #3,910 |
| 1986 | 9 | — | — | #4,750 |
| 1985 | 6 | — | — | #6,333 |
| 1984 | 12 | — | — | #3,627 |
| 1983 | 14 | — | — | #3,194 |
| 1982 | 10 | — | — | #4,169 |
| 1981 | 16 | — | — | #2,865 |
| 1980 | 5 | — | — | #7,041 |
| 1979 | 6 | — | — | #5,882 |
| 1978 | 5 | — | — | #6,538 |
| 1977 | 11 | — | — | #3,548 |
| 1976 | 6 | — | — | #5,445 |
| 1975 | 10 | — | — | #3,606 |
| 1972 | 5 | — | — | #5,555 |
| 1971 | 5 | — | — | #5,479 |
| 1970 | 8 | — | — | #3,750 |
| 1963 | 5 | — | — | #4,485 |
| 1957 | 7 | — | — | #3,487 |
| 1956 | 11 | — | — | #2,607 |