Thelonius
Boy nameThelonius has been given to 21 babies in the U.S. since 1972. It peaked in 2006.
Popularity over time births per year, 1880–2025
Total babies
21
Peak year
2006 (6 babies)
Rank in 2025
Below top 1000
First recorded
1972
10-year trend
New / returning
Gender split
All boys
Spellings & variants
Names one letter away from Thelonius — alternate spellings parents actually use.
Names with a similar vibe
Same primary gender, peaked around the same years, and roughly as common as Thelonius.
FAQ
How popular is the name Thelonius?
Thelonius has been given to 21 babies in the U.S. since 1972. It ranked below the top 1000 in 2025.
When did the name Thelonius peak?
Thelonius peaked in 2006, when 6 babies were given the name.
Is Thelonius a girl or boy name?
Thelonius is primarily a boy name (100% of babies named Thelonius are boys).
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