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Jef

Jef is classified as a male given name in our dataset. A first name alone does not establish someone’s gender or preferred form of address.

MaleLow

Confidence describes the weight of the source data, not a measured accuracy rate.

We have limited data on this name. Treat the verdict as a lead, not a certainty.

Verdict
Male
Confidence
Low (source weight below 8; not an accuracy rate)
High source frequency in
Netherlands, United States
US records 1880–2017
129 male / 0 female
Data
nam_dict (GFDL) + US SSA
Dataset built
2026-09-11

How to address Jef

If you do not know Jef’s preferred form of address, use a greeting without Mr or Ms: “Dear Jef,” in English, “Guten Tag Jef,” in German. Include their family name if you know it. The name’s classification describes its usage. Follow the form of address the person uses for themselves.

Ready-made greetings in six languages

English

Dear Jef,

German

Guten Tag Jef,

French

Bonjour Jef,

Spanish

Estimado/a Jef:

Chinese

Jef您好：

Japanese

Jef様

English

Hi Jef,

German

Hi Jef,

French

Salut Jef,

Spanish

Hola Jef,

Chinese

Jef你好：

Japanese

Jefさん

Greeting generator

This is a statistical estimate, not a statement about the gender, identity or correct form of address of any particular person.

Country breakdown

Classification of Jef by country (nam_dict and US SSA; not a survey of today’s population)
CountryHow commonUsually
Netherlandsrareman's name
United Statesrareman's name

United States birth data

129 male · 0 female · 129 births recorded

Male ≈ 100%Female ≈ 0%

Frequently asked questions

Is Jef a male or female name?

Jef is classified as a male given name in our dataset. A first name alone does not establish someone’s gender or preferred form of address.

How do I address Jef in an email?

If you do not know Jef’s preferred form of address, use a greeting without Mr or Ms: “Dear Jef,” in English, “Guten Tag Jef,” in German. Include their family name if you know it. The name’s classification describes its usage. Follow the form of address the person uses for themselves.

Is Jef a unisex name?

Jef is classified as generally male in the combined dataset. This does not rule out other uses. Our categories describe the sources, rather than a complete survey of everyone with this name.

Related names

AstridFemaleTheoMaleHenkMaleRobMaleJolandaFemaleWimMaleJosMaleEllyFemale

Sources

Gender by country: nam_dict, the c't first-names dictionary by Joerg Michael, roughly 44,000 names across 55 countries, licensed GFDL. US frequencies: United States Social Security Administration baby-name data (1880–2017), public domain. Classifications are not measured accuracy rates. Method: how we classify names. Full dataset: data & licences. US source data (babynames). Dataset built 2026-09-11; this is not a new collection date for the source records.

Cite this page

DearWho, "Is Jef a male or female name?", https://www.dearwho.app/name/jef. Data: nam_dict (J. Michael, GFDL) and US SSA, built 2026-09-11.

BibTeX
@misc{dearwho_jef,
  title  = {Is Jef a male or female name?},
  author = {{DearWho}},
  year   = {2026},
  url    = {https://www.dearwho.app/name/jef},
  note   = {Data: nam_dict (GFDL), US SSA public domain}
}