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Thelonious
Pronounced thə-LOH-nee-əs /θəˈloʊ.ni.əs/Medium
Meaning: A Latinized form of Thelonius/Tillo — from a Germanic root linked to 'a ruler of the people' (perhaps from thiuda, 'people'); routes layeredLow
Popularity in the U.S. · SSA data
U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.
SSA data updated May 2026. How we source & verify this data.
History & Origin
Thelonious is a Latinized form of Thelonius (Tillo) — linked to a Germanic root, perhaps thiuda, 'the people', read as 'a ruler of the people' (routes layered, which we note). Borne by a 7th-century saint, it was made immortal by the jazz pianist and composer Thelonious Monk. A bold, lyrical, distinctive name (said 'thə-LOH-nee-əs'; nickname Theo).
In the U.S. it appears in jazz-loving and African-American families. Rare, a-ruler-of-the-people at the (likely) root, and distinctive.
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Frequently Asked
What does the name Thelonious mean?
Thelonious is a Latinized Thelonius, linked to 'a ruler of the people'; the routes are layered.
How do you pronounce Thelonious?
It's said thə-LOH-nee-əs /θəˈloʊ.ni.əs/ — four syllables, stress on the second.
Is Thelonious a boy or girl name?
Thelonious is a boy's name.
How popular is Thelonious?
Thelonious is a rare name in the U.S.