Thelonious is a distinctive boys' name in United States, ranking #6003 in 2010 with 15 recorded births. The name reached its all-time peak in 2017 with 23 births ranking #4448. Since 1996, the popularity has increased by 150.0%. In 2010, approximately 1 in every 127,894 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.