Thaddaeus is a distinctive boys' name in United States, ranking #3440 in 2002 with 26 recorded births. This places Thaddaeus in the top 28% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2005 with 29 births ranking #3444. In 2002, approximately 1 in every 74,672 boys born was named Thaddaeus. FALLING Recent data shows the name is currently falling.