Thelonius
- US rank
- Unranked
- Syllables
- 3
- Peak
- #4,986 in 1972
0 babies were named Thelonius in the US in 2025.
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US births per million boys, 1972–2025
Similar names
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
Did you know?
A few things about Thelonius you might not know, from US birth records. Handy for convincing a partner, or a grandparent.
- HistoryThelonius first shows up in US birth records in 1972, the first year at least 5 babies got it. It has been in use for 53 years since.
- Best yearIts best year was 1972, when it reached #4,986.
About the name Thelonius
Thelonius is a boy name of German and Latin origin. It has 9 letters and 3 syllables, starting with T and ending in “-ius”. US birth records list Thelonius for boys from 1972 to 2013, in 4 of those 42 years. Its best year was 1972, when it ranked #4,986 among boy names. It hasn't been given to 5 or more US babies in a year since 2013, so today it's a genuinely rare choice.
Origin:German namesLatin names
| Decade | Babies per million | About 1 in |
|---|---|---|
| 1970s | 0.4 | 2,580,645 boys |
| 1990s | 0.3 | 3,846,154 boys |
| 2000s | 0.3 | 3,448,276 boys |
| 2010s | 0.7 | 1,538,462 boys |
More German boy names
- Boy name: Liam · resolute protector
- Unisex name: Miles · possibly gracious
- Boy name: Axel · father of peace
- Boy name: Leonardo · brave as a lion
- Boy name: Robert · bright fame
- Unisex name: Myles · possibly gracious
- Boy name: Luis · famous warrior
- Unisex name: Charlie · free man
Questions about the name Thelonius
What is the origin of the name Thelonius?
Thelonius has German, Latin roots in our records. Other German names include Liam, Miles, Axel.
Is Thelonius a boy or girl name?
Thelonius is a boy name.
How popular is the name Thelonius?
Thelonius is rare: fewer than 5 US boys got it in 2025, and it was last given to 5 or more in 2013. It peaked at #4,986 in 1972.