Theo is an established boys' name that has climbed to its highest level yet, peaking in 2023.
Theo is predominantly a boy name. In 2025 it ranked #82 among boys (3,945) and #5,894 among girls (21) — overall #145 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 3,966 | 3,982 | #5,894 | #82 |
| 2024 | 4,160 | 4,186 | #4,554 | #80 |
| 2023 | 4,182 | 4,199 | #3,705 | #78 |
| 2022 | 3,692 | 3,697 | #3,276 | #98 |
| 2021 | 2,767 | 2,767 | #2,708 | #142 |
| 2020 | 2,269 | 2,269 | #3,493 | #172 |
| 2019 | 2,049 | 2,049 | #4,534 | #195 |
| 2018 | 1,561 | 1,561 | #13,679 | #243 |
| 2017 | 1,239 | 1,239 | #13,992 | #290 |
| 2016 | 963 | 963 | #10,057 | #354 |
| 2015 | 765 | 765 | — | #406 |
| 2014 | 550 | 550 | — | #509 |
| 2013 | 365 | 365 | — | #663 |
| 2012 | 287 | 287 | — | #790 |
| 2011 | 245 | 245 | — | #863 |
| 2010 | 221 | 221 | — | #918 |
| 2009 | 187 | 187 | — | #1,033 |
| 2008 | 188 | 188 | — | #1,022 |
| 2007 | 191 | 191 | — | #1,012 |
| 2006 | 156 | 156 | — | #1,120 |
| 2005 | 139 | 139 | — | #1,154 |
| 2004 | 133 | 133 | — | #1,178 |
| 2003 | 109 | 109 | — | #1,295 |
| 2002 | 103 | 103 | #17,892 | #1,355 |
| 2001 | 84 | 84 | — | #1,471 |
| 2000 | 101 | 101 | — | #1,289 |
| 1999 | 76 | 76 | — | #1,502 |
| 1998 | 63 | 63 | — | #1,664 |
| 1997 | 62 | — | — | #1,645 |
| 1996 | 53 | — | — | #1,761 |
| 1995 | 56 | — | — | #1,646 |
| 1994 | 54 | — | — | #1,688 |
| 1993 | 50 | — | — | #1,739 |
| 1992 | 59 | — | — | #1,523 |
| 1991 | 66 | — | #15,259 | #1,466 |
| 1990 | 66 | — | — | #1,382 |
| 1989 | 77 | — | — | #1,227 |
| 1988 | 77 | — | — | #1,153 |
| 1987 | 75 | — | — | #1,112 |
| 1986 | 85 | — | — | #1,006 |
| 1985 | 76 | — | — | #1,063 |
| 1984 | 23 | — | — | #2,285 |
| 1983 | 27 | — | — | #2,011 |
| 1982 | 33 | — | — | #1,769 |
| 1981 | 31 | — | — | #1,859 |
| 1980 | 36 | — | — | #1,651 |
| 1979 | 44 | — | #10,115 | #1,565 |
| 1978 | 46 | — | — | #1,368 |
| 1977 | 51 | — | — | #1,248 |
| 1976 | 58 | — | — | #1,122 |
| 1975 | 63 | — | #8,968 | #1,124 |
| 1974 | 32 | — | — | #1,577 |
| 1973 | 27 | — | — | #1,731 |
| 1972 | 26 | — | — | #1,765 |
| 1971 | 23 | — | — | #1,908 |
| 1970 | 35 | — | #7,003 | #1,654 |
| 1969 | 34 | — | #8,589 | #1,525 |
| 1968 | 24 | — | — | #1,643 |
| 1967 | 29 | — | — | #1,443 |
| 1966 | 29 | — | #6,498 | #1,647 |
| 1965 | 43 | — | — | #1,161 |
| 1964 | 52 | — | #3,866 | #1,260 |
| 1963 | 40 | — | #5,256 | #1,398 |
| 1962 | 38 | — | #3,995 | #1,586 |
| 1961 | 52 | — | #3,309 | #1,346 |
| 1960 | 49 | — | #5,653 | #1,226 |
| 1959 | 44 | — | #4,995 | #1,320 |
| 1958 | 46 | — | #3,909 | #1,320 |
| 1957 | 57 | — | #2,641 | #1,298 |
| 1956 | 50 | — | #3,891 | #1,230 |
| 1955 | 56 | — | #2,337 | #1,337 |
| 1954 | 46 | — | #2,881 | #1,405 |
| 1953 | 51 | — | #2,585 | #1,327 |
| 1952 | 59 | — | #2,573 | #1,165 |
| 1951 | 64 | — | #2,467 | #1,066 |
| 1950 | 72 | — | #1,713 | #1,122 |
| 1949 | 58 | — | #2,128 | #1,201 |
| 1948 | 80 | — | #1,645 | #1,034 |
| 1947 | 74 | — | #1,628 | #1,175 |
| 1946 | 74 | — | #1,615 | #1,057 |
| 1945 | 101 | — | #1,094 | #941 |
| 1944 | 71 | — | #1,605 | #988 |
| 1943 | 94 | — | #1,465 | #854 |
| 1942 | 71 | — | #1,664 | #1,003 |
| 1941 | 73 | — | #1,332 | #1,047 |
| 1940 | 70 | — | #1,345 | #1,063 |
| 1939 | 91 | — | #1,470 | #762 |
| 1938 | 83 | — | #1,867 | #769 |
| 1937 | 73 | — | #1,276 | #1,011 |
| 1936 | 103 | — | #1,342 | #697 |
| 1935 | 110 | — | #1,133 | #729 |
| 1934 | 94 | — | #1,146 | #852 |
| 1933 | 101 | — | #1,137 | #781 |
| 1932 | 117 | — | #1,126 | #719 |
| 1931 | 128 | — | #1,090 | #649 |
| 1930 | 145 | — | #1,000 | #653 |
| 1929 | 146 | — | #847 | #728 |
| 1928 | 154 | — | #952 | #657 |
| 1927 | 167 | — | #1,008 | #596 |
| 1926 | 194 | — | #766 | #618 |
| 1925 | 200 | — | #734 | #644 |
| 1924 | 208 | — | #707 | #656 |
| 1923 | 167 | — | #851 | #670 |
| 1922 | 211 | — | #721 | #619 |
| 1921 | 203 | — | #749 | #615 |
| 1920 | 195 | — | #731 | #645 |
| 1919 | 201 | — | #672 | #637 |
| 1918 | 192 | — | #707 | #665 |
| 1917 | 180 | — | #739 | #631 |
| 1916 | 194 | — | #694 | #596 |
| 1915 | 189 | — | #668 | #604 |
| 1914 | 145 | — | #722 | #554 |
| 1913 | 112 | — | #746 | #551 |
| 1912 | 103 | — | #695 | #572 |
| 1911 | 67 | — | #731 | #546 |
| 1910 | 64 | — | #810 | #472 |
| 1909 | 66 | — | #586 | #572 |
| 1908 | 58 | — | #808 | #412 |
| 1907 | 60 | — | #689 | #436 |
| 1906 | 44 | — | #714 | #585 |
| 1905 | 57 | — | #608 | #475 |
| 1904 | 58 | — | #627 | #407 |
| 1903 | 47 | — | #627 | #523 |
| 1902 | 59 | — | #557 | #425 |
| 1901 | 37 | — | #765 | #464 |
| 1900 | 36 | — | #798 | #696 |
| 1899 | 26 | — | #830 | #709 |
| 1898 | 41 | — | #665 | #537 |
| 1897 | 39 | — | #581 | #676 |
| 1896 | 36 | — | #650 | #670 |
| 1895 | 39 | — | #620 | #577 |
| 1894 | 29 | — | #738 | #624 |
| 1893 | 30 | — | #686 | #646 |
| 1892 | 34 | — | #563 | #789 |
| 1891 | 32 | — | #585 | #589 |
| 1890 | 24 | — | #820 | #599 |
| 1889 | 26 | — | #616 | #783 |
| 1888 | 26 | — | #631 | #750 |
| 1887 | 29 | — | #522 | #627 |
| 1886 | 23 | — | #603 | #751 |
| 1885 | 19 | — | #694 | #759 |
| 1884 | 23 | — | #539 | #839 |
| 1883 | 21 | — | #813 | #493 |
| 1882 | 22 | — | #631 | #573 |
| 1881 | 16 | — | #670 | #697 |
| 1880 | 16 | — | #730 | #680 |