Thaddaeus is a distinctive boys' name in United States, ranking #5051 in 2006 with 18 recorded births. The name reached its all-time peak in 2005 with 29 births ranking #3444. Since 1996, the popularity has decreased by 25.0%. In 2006, approximately 1 in every 114,173 boys born was named Thaddaeus. FALLING Recent data shows the name is currently falling.