Thelonious is a distinctive boys' name in United States, ranking #6403 in 2001 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 2001, approximately 1 in every 176,621 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.