Thadd is a very rare variant of Thad that was most common in the 1970s and has all but disappeared.
Thadd is a boy name. It last appears in U.S. records in 2004. Thadd was first reported in SSA data in 1962 and peaked in 1971 (13 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2004 | 5 | 5 | #13,038 |
| 1991 | 5 | — | #9,494 |
| 1990 | 5 | — | #9,362 |
| 1983 | 5 | — | #7,233 |
| 1979 | 8 | — | #4,802 |
| 1978 | 8 | — | #4,526 |
| 1977 | 8 | — | #4,547 |
| 1975 | 6 | — | #5,399 |
| 1974 | 7 | — | #4,586 |
| 1973 | 10 | — | #3,428 |
| 1972 | 5 | — | #5,676 |
| 1971 | 13 | — | #2,800 |
| 1970 | 6 | — | #4,682 |
| 1969 | 8 | — | #3,566 |
| 1968 | 9 | — | #3,088 |
| 1967 | 9 | — | #2,967 |
| 1966 | 12 | — | #2,450 |
| 1963 | 6 | — | #4,006 |
| 1962 | 10 | — | #2,834 |