Thelonious is a distinctive boys' name in United States, ranking #8685 in 2011 with 9 recorded births. This places Thelonious in the bottom 40% 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 50.0%. In 2011, approximately 1 in every 210,999 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.