Recorded 1910–1938 Unisex name Peak 1915 142 births

Thelmer — boys' name

142 babies named Thelmer in U.S. Social Security records since 1910, with the highest year being 1915. Year-by-year trend, decade aggregates, and state-level rankings drawn from federal birth data.

1910s681920s591930s15
1910s
Peak decade

48% of everyone ever named Thelmer was born in this single decade.

1915
Single peak year

13 babies were named Thelmer in 1915 — its busiest year on record.

What the Data Says About Thelmer

The Social Security Administration has registered 142 babies named Thelmer between 1910 and 1938, spanning 29 consecutive years of U.S. birth records. As a boy's name, Thelmer currently falls outside the top 1,000 boys' names for 1938. The name reached its historical peak in 1915, when 13 babies received it in a single year. Thelmer is classified as unisex in SSA records: the opposite-sex variant accounts for 47 additional births since 1913.

Decade-level aggregation shows that Thelmer performed strongest in the 1910s, accumulating 68 births during that ten-year window. Across the 3 decades of recorded activity, Thelmer shows a clear decline from its mid-century high.

No etymological entry is currently available for Thelmer in our reference dataset. These figures derive from SSA's annual national and state-level name files, which include any name appearing at least five times in a given year or state-year; names below that threshold are suppressed for privacy and therefore excluded from the totals shown here. The 142 total represents a lower bound — actual usage may be higher in years or states where the count fell below the disclosure floor. This page is provided for informational and research purposes only and does not constitute personal, legal, or naming advice.

Thelmer at a glance

Last recorded 1938

Total births

142

Since 1910

29 years of records

Peak year

1915

13 births that year

Strongest decade: 1910s

Current rank

Unranked

Outside the modern top-1,000

As of 1938

Active since

1910

Recorded for 29 years

Last year on file: 1938

Thelmer popularity over time — boys

Annual U.S. births registered with the Social Security Administration · 1938–1910

Last recorded 1938
Peak year (1915)
13
Annual births at peak — across 29 years of records
468101214 1938192719241921191819151910 5

Thelmer popularity over time — girls

47 total births recorded since 1913 (Thelmer as girls' name)

Unisex variant — 47 births
45678910 1931192919261925192119201913 6

Thelmer by decade

Total births in each ten-year window — peak vs trough at a glance

Peak: 1910s
Peak decade
1910s
68 births that decade — 48% of Thelmer's all-time total
1910s681920s591930s15

Frequently Asked Questions

How popular is the name Thelmer?
142 babies have been named Thelmer since 1910. It was last recorded in 1938. The peak year was 1915 with 13 births.
When was Thelmer most popular?
Thelmer was most popular in the 1910s decade with 68 total births. The single peak year was 1915.
Is Thelmer a unisex name?
Yes, Thelmer is used for both boys and girls. As a boy's name it has 142 births, and as a girl's name it has 47 births.
How long has the name Thelmer been used?
Thelmer has been recorded in Social Security data since 1910, spanning 29 years of data through 1938.
What names are similar to Thelmer?
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.

Data Sources

Data as of 2024. Source: U.S. Social Security Administration (SSA).

Primary: Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications — National Data, 1910–1938 (ssa.gov/oact/babynames). National-level data includes all names with 5 or more occurrences in a given year.

State-level: Source: U.S. Social Security Administration, Baby Names — State-Level Files (namesbystate.zip). Includes all names with 5 or more occurrences per state per year; rarer names are excluded for privacy.