Thaddaeus is a distinctive boys' name in United States, ranking #8185 in 2025 with 10 recorded births. The name reached its all-time peak in 2005 with 29 births ranking #3444. Since 1996, the popularity has decreased by 58.3%. In 2025, approximately 1 in every 170,808 boys born was named Thaddaeus. FALLING Recent data shows the name is currently falling.