Thaddaeus is a distinctive boys' name in United States, ranking #4826 in 2010 with 20 recorded births. The name reached its all-time peak in 2005 with 29 births ranking #3444. Since 1996, the popularity has decreased by 16.7%. In 2010, approximately 1 in every 95,921 boys born was named Thaddaeus. FALLING Recent data shows the name is currently falling.