Thelonious is a distinctive boys' name in United States, ranking #6675 in 2003 with 11 recorded births. The name reached its all-time peak in 2017 with 23 births ranking #4448. Since 1996, the popularity has increased by 83.3%. In 2003, approximately 1 in every 179,570 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.