Detlefsen

surname · Latin script

Recorded as a female name· opposite-gender records fall within measured source noise

/ˈdɛtɫɪfsən/(machine-generated) pronunciation, model-generated

Detlefsen is a surname written in the Latin script, with more bearers in Germany than in any other country. Recorded meaning: Borrowed from Danish and North German Detlefsen.

rarermore common
  • DEGermany≈1 in 78K(inferred from the name graph)
  • USUnited States1 in 555K
  • DKDenmark1 in 31K

carrying the name, as counted by its national register where one exists and as Mondonomo estimates it elsewhere (marked ≈ and "est." on hover). One hue, darker where it is more common; hover a country for its figure.

Germany (inferred from the name graph)

≈1,000 people, est.

Sources
168 (measured from records)

Highest-authority source

1 in 31K (inferred from the name graph)

Denmark

measured from records inferred from the name graph

Name dossier (print, CSV)

Meaning & origin(measured from records)

Borrowed from Danish and North German Detlefsen.

Sources 1

Where in the world(measured from records)

Detlefsen counted together with the spellings and other-language forms grouped with it. Where a register counted another spelling, the row names it.

Sorted by bearers: national registers' counts, and Mondonomo's estimates (≈, est.) where no register counts.

Where Detlefsen is recorded, by country
CountryMost common spellingSources
DE Germany≈1,000 est.≈1 in 78K—Detlefsen86
US United States5991 in 555K599Detlefsen168
DK Denmark1921 in 31K192Detlefsen33
TN Tunisia≈110 est.≈1 in 110K—Detlefsen2
AR Argentina901 in 505K90——
LB Lebanon≈51 est.≈1 in 107K—Detlefsen1
PS Palestine≈43 est.≈1 in 113K—Detlefsen1

Exact figures are national registers' own counts, while figures marked ≈ and est. are Mondonomo’s estimates, counted from our sources and calibrated against those registers; hover one for how far to trust it in that country. A dash means neither exists.

Registers cited: Census Bureau — Surname Frequency 2010; Danmarks Statistik — Hvor mange hedder...? (living-population name counts); RENAPER — Apellidos (person counts, national). Figures without a register are Mondonomo estimates; see Methodology.

Country figures for a list of names, at full precision, are available under licence rather than by scraping this table (how that works).

Notable people with this name(measured from records)

18001850190019502000Detlef Detlefsen, b. 1833Otto Detlefsen, b. 1881Hans Detlefsen, b. 1923Linde Detlefsen, b. 1944Michael Detlefsen, b. 1948Lars Detlefsen, b. 1967Louise Detlefsen, b. 1971Kai Detlefsen, b. 1976

The ten people covered by the most Wikipedia language editions — a proxy for cross-cultural notability, which favours historical and Western figures over equally prominent contemporary ones — shown by birth year. Source: Wikidata (CC0).

How to address them(machine-generated)

FormalDear Detlefsen,
InformalHello,

Evidence(measured from records)

Attested in 14 sources across 8 countries.

Official registers attesting Detlefsen
CountryRegisterYearCountRank
US United StatesCensus Bureau — Surname Frequency 20102010599#37,229
US United StatesCensus Bureau — Surname Frequency 20202020585#40,393
US United StatesCensus Bureau — Surname Frequency 20002000553#37,788
DK DenmarkDanmarks Statistik — Hvor mange hedder...? (living-population name counts)—192#2,644
AR ArgentinaRENAPER — Apellidos (person counts, national)—90—
US United Stateswru Name Dictionary — US surnames, Census 2010 subset (Khanna et al.)———

Reference works 3

These works list the name; their figures are licensed and are not reproduced here.

Register rows as of the 2026-10-09 data build.

Frequently asked questions

What does the name Detlefsen mean, and where does it come from?
Borrowed from Danish and North German Detlefsen. Recorded by Wiktionary.
How do you pronounce Detlefsen?
A machine transcription gives /ˈdɛtɫɪfsən/ (IPA) for English.
In which country does Detlefsen have the most bearers?
Mondonomo estimates about 1.0 thousand people named Detlefsen in Germany, more than in any other country we hold, where it is most often spelled detlefsen.
Where is Detlefsen most common?
Measured as a share of residents rather than as a count, Detlefsen is densest in Denmark — about 1 in 31 thousand people — even though Germany holds more of our records for it.
How common is the name Detlefsen?
In the United States, the national register counted 599 people named Detlefsen in 2010, about 1 in 555 thousand residents.

What do you want to know about Detlefsen?

Nobody replies to these one by one, but what readers ask decides what these pages answer next.

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Query this name via API
curl -H "X-API-Key: YOUR_KEY" https://api.mondonomo.ai/api/v1/name-graph/detlefsen

The payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. It takes a free API key (1,000 requests a day), which returns what this page shows everyone; the full country table, every register citation and the year-by-year series come with a licensed key, as does bulk access.

About this data

measured from records inferred from the name graph machine-generated

These figures come from the data snapshot of and will change as it is rebuilt.

Statistics are aggregated from the Mondonomo name corpus; related names and etymology are inferred from the name graph; pronunciation and any machine-marked transliterations are model-generated. Read how the numbers are made, including their known failure modes, and where the data comes from.

Reference works we consult — surname dictionaries, official name registers, Wikidata and Wiktionary — are named directly, beside the claims they support. The per-country source counts also include datasets of person records: we publish how many there are and their authority tier, but not their names.

Cite this page Mondonomo, “Detlefsen”. Data snapshot 2026-10-10.

See how Detlefsen parses inside a full name →