Thaddaeus is a distinctive boys' name in United States, ranking #3732 in 2008 with 29 recorded births. The name reached its all-time peak in 2005 with 29 births ranking #3444. Since 1996, the popularity has increased by 20.8%. In 2008, approximately 1 in every 70,343 boys born was named Thaddaeus. FALLING Recent data shows the name is currently falling.