Onetha is a very rare girls' name that was most common in the 1940s and has all but disappeared.
Onetha is a girl name. It last appears in U.S. records in 1959. Onetha first appears in 1925 and peaked in 1949 (9 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1959 | 7 | — | #5,412 |
| 1955 | 5 | — | #6,476 |
| 1950 | 6 | — | #5,133 |
| 1949 | 9 | — | #3,816 |
| 1943 | 5 | — | #5,186 |
| 1942 | 6 | — | #4,499 |
| 1940 | 6 | — | #4,231 |
| 1937 | 5 | — | #4,765 |
| 1935 | 5 | — | #4,732 |
| 1932 | 6 | — | #4,294 |
| 1927 | 7 | — | #4,173 |
| 1926 | 7 | — | #4,205 |
| 1925 | 5 | — | #5,584 |