Thelonious is a distinctive boys' name in United States, ranking #7144 in 2025 with 12 recorded births. The name reached its all-time peak in 2017 with 23 births ranking #4448. Since 1996, the popularity has increased by 100.0%. In 2025, approximately 1 in every 142,340 boys born was named Thelonious. STABLE Recent data shows the name is currently stable.