Thaddeaus is a distinctive boys' name in United States, ranking #14388 in 2008 with 5 recorded births. This places Thaddeaus in the bottom 2% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2001 with 10 births ranking #6885. Since 1996, the popularity has decreased by 28.6%. In 2008, approximately 1 in every 407,989 boys born was named Thaddeaus. FALLING Recent data shows the name is currently falling.