Thomasa is a rare variant of Thomas that was most common in the 1960s and has all but disappeared.
Thomasa is a girl name. It last appears in U.S. records in 1992. Thomasa was first reported in SSA data in 1921 and peaked in 1961 (20 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1992 | 5 | — | #15,415 |
| 1991 | 6 | — | #13,010 |
| 1987 | 5 | — | #13,111 |
| 1986 | 6 | — | #10,805 |
| 1983 | 8 | — | #7,988 |
| 1981 | 7 | — | #9,027 |
| 1980 | 6 | — | #10,289 |
| 1979 | 9 | — | #7,273 |
| 1978 | 10 | — | #6,354 |
| 1977 | 6 | — | #9,550 |
| 1974 | 9 | — | #6,220 |
| 1973 | 5 | — | #9,685 |
| 1971 | 7 | — | #7,318 |
| 1969 | 5 | — | #8,593 |
| 1968 | 7 | — | #6,197 |
| 1967 | 8 | — | #5,413 |
| 1966 | 8 | — | #5,238 |
| 1965 | 15 | — | #3,391 |
| 1964 | 14 | — | #3,684 |
| 1963 | 20 | — | #2,853 |
| 1962 | 14 | — | #3,578 |
| 1961 | 20 | — | #2,828 |
| 1960 | 14 | — | #3,500 |
| 1959 | 13 | — | #3,601 |
| 1958 | 7 | — | #5,360 |
| 1957 | 13 | — | #3,475 |
| 1956 | 7 | — | #5,274 |
| 1955 | 9 | — | #4,354 |
| 1951 | 8 | — | #4,351 |
| 1949 | 6 | — | #5,207 |
| 1938 | 6 | — | #4,302 |
| 1924 | 11 | — | #3,129 |
| 1922 | 5 | — | #5,708 |
| 1921 | 5 | — | #5,788 |