Thadius is a rare variant of Thaddeus that peaked in 1974 and has since faded.
Thadius is a boy name. It last appears in U.S. records in 2024. Thadius was first reported in SSA data in 1922 and peaked in 1974 (19 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2024 | 7 | 7 | #10,810 |
| 2020 | 5 | 5 | #13,845 |
| 2019 | 6 | 6 | #11,991 |
| 2018 | 6 | 6 | #11,991 |
| 2016 | 8 | 8 | #9,581 |
| 2015 | 7 | 7 | #10,513 |
| 2014 | 6 | 6 | #11,960 |
| 2013 | 8 | 8 | #9,571 |
| 2012 | 9 | 9 | #8,794 |
| 2011 | 5 | 5 | #14,134 |
| 2010 | 6 | 6 | #12,063 |
| 2009 | 7 | 7 | #10,852 |
| 2008 | 10 | 10 | #8,243 |
| 2007 | 6 | 6 | #12,203 |
| 2006 | 6 | 6 | #11,913 |
| 2005 | 8 | 8 | #9,009 |
| 2004 | 9 | 9 | #8,085 |
| 2003 | 8 | 8 | #8,555 |
| 2002 | 12 | 12 | #6,044 |
| 2001 | 9 | 9 | #7,457 |
| 2000 | 6 | 6 | #10,236 |
| 1999 | 7 | 7 | #8,623 |
| 1998 | 14 | 14 | #4,848 |
| 1997 | 12 | — | #5,255 |
| 1996 | 10 | — | #5,938 |
| 1995 | 11 | — | #5,467 |
| 1994 | 14 | — | #4,511 |
| 1993 | 11 | — | #5,320 |
| 1992 | 15 | — | #4,084 |
| 1991 | 14 | — | #4,204 |
| 1990 | 8 | — | #6,359 |
| 1989 | 9 | — | #5,558 |
| 1988 | 9 | — | #5,169 |
| 1987 | 13 | — | #3,705 |
| 1986 | 11 | — | #4,101 |
| 1985 | 10 | — | #4,307 |
| 1984 | 9 | — | #4,519 |
| 1982 | 10 | — | #4,205 |
| 1981 | 11 | — | #3,832 |
| 1980 | 7 | — | #5,469 |
| 1979 | 12 | — | #3,549 |
| 1978 | 7 | — | #5,005 |
| 1977 | 16 | — | #2,773 |
| 1976 | 9 | — | #3,985 |
| 1975 | 11 | — | #3,411 |
| 1974 | 19 | — | #2,266 |
| 1973 | 11 | — | #3,196 |
| 1972 | 17 | — | #2,317 |
| 1971 | 9 | — | #3,628 |
| 1970 | 7 | — | #4,194 |
| 1969 | 6 | — | #4,364 |
| 1968 | 7 | — | #3,641 |
| 1951 | 6 | — | #3,677 |
| 1924 | 5 | — | #4,890 |
| 1923 | 5 | — | #4,816 |
| 1922 | 5 | — | #4,888 |