Boys' name · since 1972

Thelonius

Since 1972, U.S. Social Security records show 21 babies named Thelonius, peaking in 2006. See the year-by-year trend, decade totals, and state rankings below, sourced from federal birth data.

#28,854 of 45,481
all-time among boys
21
born since 1972
2000s
peak decade

Thelonius is not among the current top-ranked boys names; 21 have been recorded since 1972.

Thelonius has 21 recorded births among boys since 1972, per the U.S. Social Security Administration, though it falls outside today's most-used boys names, busiest in the 2000s -- see the year-by-year trends, decade totals, and state-level distribution below, all drawn directly from SSA birth-registration files spanning 1972 to 2013.

  • #28,854 of 45,481 all-time among boys
  • 21 born since 1972
  • 2000s peak decade

Data updated Aug 2026

The verdict

According to the U.S. Social Security Administration, Thelonius ranks #28,854 of 45,481 boys' names by all-time recorded births (highest first). 21 born since 1972, peaking in the 2000s.

#28,854 of 45,481
all-time among boys
21
born since 1972
2000s
peak decade
Below the archive median
All-time archive position

Thelonius's 21 recorded births place it above 36.43% of the 45,481 boys names in the full SSA archive.

National only
State-record footprint

No state rows cleared SSA’s public reporting threshold for this name.

Thelonius's usage pattern, beyond the headline number

Splitting Thelonius's full recorded timeline at 2006, 52% of its total births fall in the more recent half of the record versus 48% in the earlier half -- a fairly even split across the full record. Its quietest year on record was 1972, with just 5 recorded births -- worth weighing against the 2006 peak of 6 to see the full range of the name's swing in popularity.

Thelonius popularity over time

Annual U.S. births registered with the Social Security Administration · 1972–2013

Last recorded 2013
Peak year (2006)
6
Annual births at peak, across 42 years of records
4.555.566.5 1972199820062013 5

Thelonius by decade

2000s is the heaviest window (6 births, 29% of the file).

2000s was Thelonius's strongest decade.

6 babies received the name during that ten-year window, about 29% of all-time use.

Thelonius births by decade

Total births in each ten-year window

births

What this shows Peak: 2000s at 6 births (29% of all-time use).

Source U.S. Social Security Administration · Baby Names As of August 2026

Frequently Asked Questions

How popular is the name Thelonius? ▼
Thelonius has been given to 21 babies in the U.S. since 1972, according to SSA data. Its archive ordinal is #28,854 of 45,481 among boys' names (total births, highest first). Its last appearance in the data was 2013. 6 babies were born in 2006, its single highest year.
Where does Thelonius sit in the SSA name archive? ▼
According to the U.S. Social Security Administration, Thelonius ranks #28,854 of 45,481 boys' names by all-time recorded births (highest first). All-time ordinal matches browse popularity (total births DESC); the current ordinal uses the null SSA file. See /methodology#corpus-placement.
When was Thelonius most popular? ▼
Thelonius was most popular in the 2000s decade with 6 total births. The single peak year was 2006.
How long has the name Thelonius been used? ▼
The SSA has tracked Thelonius since 1972 -- 42 years through the most recent 2013 data.
What names are similar to Thelonius? ▼
Names with a similar sound or spelling include Theodore, Theo, Theron, Theadore, and 4 more. These share a common prefix and are also used for boys.

What to do with Thelonius's data

  • Thelonius's usage has stayed within range of its 2000s decade-level peak (6 total births) through the 2010s (5) -- a comparatively stable name, not a fading trend.

Figures reflect SSA-reported births only; see the methodology above for the privacy-suppression floor.

Keep exploring Thelonius

Nearby Names Like Thelonius

Names with a similar sound, spelling, or feel to Thelonius

Theodore Boy
#4 317,206 births
Theo Boy
#82 35,830 births
Theron Boy
#2453 12,960 births
Theadore Boy
#12032 4,005 births
Theophilus Boy
#2392 2,448 births

Compare Thelonius side by side: Thelonius vs Theodore Thelonius vs Theo Thelonius vs Theron

Or pick any two names to compare →

Related Names

Names with a similar number of total births

Lute
21 births · Peak 1927
Dewy
21 births · Peak 1898
Wince
21 births · Peak 1914
Waddie
21 births · Peak 1919
Benhard
21 births · Peak 1922
Ludy
21 births · Peak 1916
Narcisse
21 births · Peak 1918
Vassar
21 births · Peak 1917

Nationwide names with similar peak year or record span

Two nationwide peer axes for Thelonius: closest SSA peak year, and closest first→latest record span. Distinct from the spelling and current-rank neighborhoods above.

Peak year is the single SSA year with the most births for that name; record span is first-to-latest year in the national files, not a recommendation or shared origin claim.

Data Sources

Data as of August 2026. Source: U.S. Social Security Administration (SSA).

According to the Social Security Administration, this profile draws directly from the agency's public-use baby-name files (updated June 2026). See our methodology for the full extraction, aggregation, and privacy-suppression rules.

Primary: Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications, National Data, 1972–2013 (ssa.gov/oact/babynames).

State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).

Name Almanac is rendered directly from the Social Security Administration's public baby-name files, no number is typed in by an editor. This profile for Thelonius draws directly on SSA national and state-level files, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.