Ortha is a very rare girls' name that was most common in the 1920s and has all but disappeared.
Ortha is a girl name. It last appears in U.S. records in 1942. Ortha first appears in 1904 and peaked in 1923 (20 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1942 | 5 | — | #5,192 |
| 1941 | 5 | — | #4,903 |
| 1934 | 11 | — | #2,694 |
| 1932 | 9 | — | #3,220 |
| 1931 | 11 | — | #2,716 |
| 1930 | 6 | — | #4,430 |
| 1929 | 10 | — | #3,086 |
| 1928 | 7 | — | #4,093 |
| 1927 | 5 | — | #5,418 |
| 1926 | 13 | — | #2,678 |
| 1925 | 14 | — | #2,585 |
| 1924 | 12 | — | #2,932 |
| 1923 | 20 | — | #2,006 |
| 1922 | 9 | — | #3,599 |
| 1921 | 15 | — | #2,472 |
| 1920 | 11 | — | #3,050 |
| 1919 | 11 | — | #2,960 |
| 1918 | 9 | — | #3,453 |
| 1917 | 8 | — | #3,628 |
| 1916 | 11 | — | #2,790 |
| 1915 | 10 | — | #2,855 |
| 1913 | 9 | — | #2,291 |
| 1912 | 11 | — | #1,808 |
| 1911 | 7 | — | #2,139 |
| 1909 | 9 | — | #1,573 |
| 1904 | 6 | — | #1,812 |