Thaddaeus is a distinctive boys' name in United States, ranking #3749 in 2000 with 22 recorded births. This places Thaddaeus in the top 31% 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 2000, approximately 1 in every 89,270 boys born was named Thaddaeus. FALLING Recent data shows the name is currently falling.