Thelonious is a distinctive boys' name in United States, ranking #4448 in 2017 with 23 recorded births. The name reached its all-time peak in 2017 with 23 births ranking #4448. Since 1996, the popularity has increased by 283.3%. In 2017, approximately 1 in every 80,449 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.