Rainer is a rare boys' name that peaked in 2018 and remains in steady use.
Rainer is predominantly a boy name. In 2025 it ranked #3,429 for boy births in the United States (and #7,390 across all names), given to 34 babies. Rainer was first reported in SSA data in 1955 and peaked in 2018 (53 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 34 | 34 | — | #3,429 |
| 2024 | 51 | 51 | — | #2,624 |
| 2023 | 45 | 45 | — | #2,838 |
| 2022 | 44 | 44 | — | #2,906 |
| 2021 | 53 | 53 | — | #2,518 |
| 2020 | 49 | 49 | #14,729 | #2,829 |
| 2019 | 35 | 35 | — | #3,326 |
| 2018 | 53 | 53 | — | #2,464 |
| 2017 | 48 | 48 | — | #2,623 |
| 2016 | 43 | 43 | — | #2,823 |
| 2015 | 36 | 36 | — | #3,211 |
| 2014 | 35 | 35 | — | #3,201 |
| 2013 | 27 | 27 | — | #3,832 |
| 2012 | 23 | 23 | — | #4,354 |
| 2011 | 19 | 19 | — | #4,942 |
| 2010 | 20 | 20 | #19,192 | #5,969 |
| 2009 | 29 | 29 | #19,536 | #4,247 |
| 2008 | 29 | 29 | — | #3,714 |
| 2007 | 22 | 22 | — | #4,467 |
| 2006 | 27 | 27 | — | #3,752 |
| 2005 | 25 | 25 | — | #3,793 |
| 2004 | 18 | 18 | — | #4,741 |
| 2003 | 10 | 10 | — | #7,118 |
| 2002 | 17 | 17 | — | #4,659 |
| 2001 | 18 | 18 | — | #4,423 |
| 2000 | 10 | 10 | — | #6,711 |
| 1999 | 8 | 8 | — | #7,703 |
| 1998 | 11 | 11 | — | #5,746 |
| 1997 | 14 | — | — | #4,622 |
| 1996 | 15 | — | — | #4,343 |
| 1995 | 17 | — | — | #3,812 |
| 1994 | 15 | — | — | #4,245 |
| 1993 | 16 | — | — | #3,972 |
| 1992 | 11 | — | — | #5,166 |
| 1991 | 10 | — | — | #5,413 |
| 1990 | 12 | — | — | #4,611 |
| 1989 | 6 | — | — | #7,682 |
| 1988 | 13 | — | — | #3,852 |
| 1987 | 6 | — | — | #6,753 |
| 1986 | 17 | — | — | #2,979 |
| 1985 | 20 | — | — | #2,572 |
| 1984 | 11 | — | — | #3,874 |
| 1983 | 7 | — | — | #5,343 |
| 1982 | 6 | — | — | #6,212 |
| 1980 | 5 | — | — | #7,040 |
| 1978 | 5 | — | — | #6,536 |
| 1977 | 11 | — | — | #3,547 |
| 1976 | 8 | — | — | #4,312 |
| 1975 | 7 | — | — | #4,668 |
| 1974 | 6 | — | — | #5,093 |
| 1972 | 5 | — | — | #5,554 |
| 1971 | 6 | — | — | #4,783 |
| 1970 | 6 | — | — | #4,603 |
| 1969 | 9 | — | — | #3,258 |
| 1968 | 13 | — | — | #2,418 |
| 1967 | 8 | — | — | #3,181 |
| 1966 | 18 | — | — | #1,870 |
| 1965 | 13 | — | — | #2,347 |
| 1964 | 21 | — | — | #1,783 |
| 1963 | 15 | — | — | #2,183 |
| 1962 | 15 | — | — | #2,169 |
| 1961 | 10 | — | — | #2,852 |
| 1960 | 13 | — | — | #2,403 |
| 1959 | 11 | — | — | #2,631 |
| 1958 | 14 | — | — | #2,242 |
| 1957 | 9 | — | — | #2,978 |
| 1956 | 6 | — | — | #3,847 |
| 1955 | 7 | — | — | #3,433 |