Thaddaeus is a distinctive boys' name in United States, ranking #3220 in 2001 with 28 recorded births. The name reached its all-time peak in 2005 with 29 births ranking #3444. Since 1996, the popularity has increased by 16.7%. In 2001, approximately 1 in every 69,387 boys born was named Thaddaeus. FALLING Recent data shows the name is currently falling.