Thaddeaus is a distinctive boys' name in United States, ranking #12201 in 2007 with 6 recorded births. The name reached its all-time peak in 2001 with 10 births ranking #6885. Since 1996, the popularity has decreased by 14.3%. In 2007, approximately 1 in every 345,873 boys born was named Thaddeaus. FALLING Recent data shows the name is currently falling.