Thelonious
#7,140 in 2025Boys' nameMeaning not yet documented
Thelonious has been given to 467 babies in the U.S. since 1960. In 2025 it ranked #7,140 of 13,926 boys’ names in use. Its peak year was 2017, with 23 recorded.
Babies named Thelonious, 2025
1 in 276,000
Thelonious over time, 1880–2025
Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.
How common is Thelonious?
Everything below is computed from the 2025 data — the most recent year available.
- Among all babies, 2025
- 1 in 276,000
- 12 of 3,315,165 births
- Among boys only
- 1 in 142,000
- <0.01% of boys
- Rank, 2025
- #7,140
- of 13,926 boys’ names in use
- Coin-flip room size
- 191,493 kids
- Even odds of a second one
Where Thelonious sits on the popularity scale
Chance at least one other child shares the name
If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.
Put another way: gather 191,493 children born in 2025 and it's an even bet that one of them is another Thelonious. In a class of 30 the chance is Under 1%.
When Theloniouss were born
Half of everyone ever recorded as Thelonious was born before 2012 — so the typical Thelonious is around 13 today.
- Biggest decade
- 2010s
- 36.4% of all use
- Born in the last 25 years
- 74.5%
- A modern name
- Recorded since 1950
- 467
- People you could plausibly meet
2010s — 36.4% of all recorded uses (170).
Is Thelonious rising or falling?
Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.
- Rank vs 1 year ago
- −1,274
- Places dropped
- Rank vs 5 years ago
- −1,472
- Places dropped
- Rank vs 10 years ago
- −2,455
- Places dropped
- Births vs 10 years ago
- 0.57×
- Fewer babies than then
- Share of its own peak
- 52.2%
- Peak was 2017 (23)
- Years since peak
- 8
- Years
- Year-to-year steadiness
- Volatile
- 29.6% average annual change
Where Thelonious is used
Across 1910–2025, Thelonious was most concentrated in California — about 1 in — boys, against 1 in 645,656 across all states with data.
Most concentrated
- 1California1 in —
Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Thelonious has too little recent state data to map, so this covers all years from 1910.
Thelonious around the world
Where Thelonious ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.
- England & Wales2002–2020#4,608in 2020
- Canada2017–2017#2,766in 2017
- South Australia1999–1999#539in 1999
Popularity data from Office for National Statistics, Statistics Canada and Consumer and Business Services (South Australia). ONS data under Open Government Licence v3.0. StatCan data under Statistics Canada Open Licence. CBS SA data under CC BY 4.0.
Thelonious by the numbers
The raw record for each sex the name is used for.
Names similar to Thelonious
Matched on shared beginnings and endings, similar length, and comparable popularity.
Sibling names for Thelonious
Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.