Thaddaeus is a distinctive boys' name in United States, ranking #6052 in 2009 with 15 recorded births. The name reached its all-time peak in 2005 with 29 births ranking #3444. Since 1996, the popularity has decreased by 37.5%. In 2009, approximately 1 in every 132,220 boys born was named Thaddaeus. FALLING Recent data shows the name is currently falling.