Thadeus is a distinctive boys' name in United States, ranking #3721 in 1997 with 19 recorded births. The name reached its all-time peak in 2007 with 23 births ranking #4354. Since 1996, the popularity has increased by 111.1%. In 1997, approximately 1 in every 99,215 boys born was named Thadeus. RISING Recent data shows the name is currently rising.