Thaddeaus is a very rare variant of Thaddeus that was most common in the 1990s and has all but disappeared.
Thaddeaus is a boy name. It last appears in U.S. records in 2010. Thaddeaus was first reported in SSA data in 1918 and peaked in 1993 (10 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2010 | 5 | 5 | #14,047 |
| 2008 | 5 | 5 | #14,389 |
| 2007 | 6 | 6 | #12,202 |
| 2005 | 7 | 7 | #10,040 |
| 2002 | 5 | 5 | #12,315 |
| 2001 | 10 | 10 | #6,885 |
| 1999 | 5 | 5 | #11,439 |
| 1996 | 7 | — | #7,890 |
| 1993 | 10 | — | #5,734 |
| 1991 | 5 | — | #9,495 |
| 1990 | 9 | — | #5,767 |
| 1989 | 8 | — | #6,175 |
| 1987 | 5 | — | #8,031 |
| 1986 | 6 | — | #6,648 |
| 1985 | 7 | — | #5,713 |
| 1981 | 6 | — | #6,177 |
| 1979 | 6 | — | #5,977 |
| 1978 | 9 | — | #4,130 |
| 1975 | 7 | — | #4,752 |
| 1924 | 5 | — | #4,889 |
| 1918 | 5 | — | #4,739 |