Thaddaeus is a distinctive boys' name in United States, ranking #5720 in 2015 with 16 recorded births. The name reached its all-time peak in 2005 with 29 births ranking #3444. Since 1996, the popularity has decreased by 33.3%. In 2015, approximately 1 in every 119,766 boys born was named Thaddaeus. FALLING Recent data shows the name is currently falling.