Thadeus is a distinctive boys' name in United States, ranking #11845 in 2025 with 6 recorded births. The name reached its all-time peak in 2007 with 23 births ranking #4354. Since 1996, the popularity has decreased by 33.3%. In 2025, approximately 1 in every 284,679 boys born was named Thadeus. RISING Recent data shows the name is currently rising.