Thadeus is a distinctive boys' name in United States, ranking #5016 in 2000 with 15 recorded births. The name reached its all-time peak in 2007 with 23 births ranking #4354. Since 1996, the popularity has increased by 66.7%. In 2000, approximately 1 in every 130,929 boys born was named Thadeus. RISING Recent data shows the name is currently rising.