Thelonious is a distinctive boys' name in United States, ranking #4901 in 2018 with 20 recorded births. This places Thelonious in the top 35% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2017 with 23 births ranking #4448. Since 1996, the popularity has increased by 233.3%. In 2018, approximately 1 in every 90,774 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.