Thelonious is a distinctive boys' name in United States, ranking #5375 in 2013 with 17 recorded births. The name reached its all-time peak in 2017 with 23 births ranking #4448. Since 1996, the popularity has increased by 183.3%. In 2013, approximately 1 in every 111,250 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.