Thaddeaus is a distinctive boys' name in United States, ranking #6885 in 2001 with 10 recorded births. The name reached its all-time peak in 2001 with 10 births ranking #6885. Since 1996, the popularity has increased by 42.9%. In 2001, approximately 1 in every 194,283 boys born was named Thaddeaus. FALLING Recent data shows the name is currently falling.