Thelonious is a distinctive boys' name in United States, ranking #6371 in 2019 with 14 recorded births. The name reached its all-time peak in 2017 with 23 births ranking #4448. Since 1996, the popularity has increased by 133.3%. In 2019, approximately 1 in every 128,097 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.