Declining since 2017, #6,803 for boys today.
Popularity of Thelonious since 1960
Babies named Thelonious per year in U.S. Social Security records.
Data table (by decade)
| Decade | Boys |
|---|---|
| 1960s | 37 |
| 1970s | 24 |
| 1980s | 14 |
| 1990s | 36 |
| 2000s | 90 |
| 2010s | 170 |
| 2020s | 96 |
Meaning & origin
Thelonious is a distinctive and rare name, strongly associated with the legendary jazz pianist Thelonious Monk. First recorded in the 1960s, it remains an uncommon choice, ranking 6,803 in 2025 with only about 1 in 142,340 boys receiving the name. Its popularity peaked in 2021, though it has been declining since 2017. The name has no strong regional ties in the United States, used sporadically across the country. Its etymology is uncertain, but parent often choose it for its musical, artistic connotations rather than any traditional meaning.
The name Thelonious first appears in the 1960s, most famously popularized by the American jazz pianist Thelonious Monk. It is thought to be a creative respelling of Theophilus, a Greek name meaning 'loved by God,' or a variant of the Greek elements 'theos' (god) and 'laos' (people). However, its precise derivation is uncertain and it is best considered a modern coinage inspired by Monk's distinctive style.
Nicknames & variants
Nicknames: Theo, Lonnie
Variants: Thelonius, Thelonious
Sibling names for Thelonious
Names that share Thelonious's style, for a brother or sister.
