Thelonious is a distinctive boys' name in United States, ranking #9487 in 2006 with 8 recorded births. The name reached its all-time peak in 2017 with 23 births ranking #4448. Since 1996, the popularity has increased by 33.3%. In 2006, approximately 1 in every 256,890 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.