Theseus is a distinctive boys' name in United States, ranking #2758 in 2015 with 44 recorded births. This places Theseus in the top 20% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2015 with 44 births ranking #2758. In 2015, approximately 1 in every 43,551 boys born was named Theseus. FALLING Recent data shows the name is currently falling.