Osa is a rare name used for both girls and boys that peaked in 1918 and has since faded.
Osa is predominantly a girl name. In 2025 it ranked #10,713 for girl births in the United States (and #18,116 across all names), given to 9 babies. Osa first appears in 1880 and peaked in 1892 (21 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 9 | 9 | #10,713 | — |
| 2024 | 6 | 6 | #14,851 | — |
| 2023 | 5 | 5 | #17,001 | — |
| 2021 | 5 | 5 | #17,058 | — |
| 2019 | 5 | 5 | #17,368 | — |
| 2017 | 11 | 11 | #15,460 | #13,730 |
| 2011 | 6 | 6 | #16,279 | — |
| 1964 | 5 | — | #7,499 | — |
| 1950 | 8 | — | #4,225 | — |
| 1948 | 5 | — | #5,817 | — |
| 1947 | 8 | — | #4,248 | — |
| 1946 | 8 | — | #3,902 | — |
| 1941 | 5 | — | #4,905 | — |
| 1940 | 5 | — | #4,870 | — |
| 1939 | 9 | — | #3,091 | — |
| 1937 | 13 | — | #2,419 | — |
| 1936 | 6 | — | #4,047 | — |
| 1935 | 8 | — | #3,363 | — |
| 1931 | 8 | — | #3,419 | — |
| 1930 | 18 | — | #2,530 | #4,408 |
| 1929 | 12 | — | #5,120 | #3,462 |
| 1928 | 12 | — | #5,262 | #3,618 |
| 1927 | 8 | — | #3,790 | — |
| 1926 | 7 | — | #4,214 | — |
| 1925 | 17 | — | #2,898 | #4,727 |
| 1924 | 7 | — | #4,343 | — |
| 1923 | 18 | — | #2,145 | — |
| 1922 | 15 | — | #2,458 | — |
| 1921 | 25 | — | #2,473 | #2,929 |
| 1920 | 25 | — | #2,340 | #3,149 |
| 1919 | 17 | — | #2,769 | #4,640 |
| 1918 | 28 | — | #1,865 | #3,616 |
| 1917 | 21 | — | #2,182 | #4,423 |
| 1916 | 21 | — | #2,791 | #2,685 |
| 1915 | 24 | — | #1,939 | #3,311 |
| 1914 | 11 | — | #3,508 | #3,620 |
| 1913 | 9 | — | #2,292 | — |
| 1911 | 7 | — | #2,140 | — |
| 1910 | 5 | — | #2,697 | — |
| 1909 | 8 | — | #1,720 | — |
| 1908 | 8 | — | #1,646 | — |
| 1907 | 12 | — | #1,194 | — |
| 1906 | 18 | — | #889 | — |
| 1904 | 17 | — | #901 | — |
| 1903 | 12 | — | #1,065 | — |
| 1902 | 11 | — | #1,118 | — |
| 1901 | 10 | — | #1,118 | — |
| 1900 | 13 | — | #1,093 | — |
| 1899 | 17 | — | #812 | — |
| 1898 | 8 | — | #1,353 | — |
| 1897 | 11 | — | #1,022 | — |
| 1896 | 10 | — | #1,105 | — |
| 1895 | 12 | — | #972 | — |
| 1894 | 16 | — | #774 | — |
| 1893 | 15 | — | #786 | — |
| 1892 | 21 | — | #633 | — |
| 1891 | 17 | — | #659 | — |
| 1890 | 12 | — | #816 | — |
| 1889 | 7 | — | #1,114 | — |
| 1888 | 10 | — | #878 | — |
| 1887 | 7 | — | #1,014 | — |
| 1886 | 11 | — | #723 | — |
| 1885 | 5 | — | #1,162 | — |
| 1884 | 8 | — | #836 | — |
| 1883 | 8 | — | #744 | — |
| 1882 | 8 | — | #721 | — |
| 1881 | 9 | — | #615 | — |
| 1880 | 7 | — | #723 | — |