Thelonious is a distinctive boys' name in United States, ranking #4481 in 2021 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 2021, approximately 1 in every 76,010 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.