Thadeus is a distinctive boys' name in United States, ranking #6361 in 2008 with 14 recorded births. The name reached its all-time peak in 2007 with 23 births ranking #4354. Since 1996, the popularity has increased by 55.6%. In 2008, approximately 1 in every 145,711 boys born was named Thadeus. RISING Recent data shows the name is currently rising.