Thadeus is a distinctive boys' name in United States, ranking #4454 in 2001 with 18 recorded births. The name reached its all-time peak in 2007 with 23 births ranking #4354. Since 1996, the popularity has increased by 100.0%. In 2001, approximately 1 in every 107,935 boys born was named Thadeus. RISING Recent data shows the name is currently rising.