Koos
Koos is a male given name: 98% of people named Koos are men, and it is recorded as male in 1 of the 1 countries covered.
- Verdict
- Male
- Male / female split
- 98% male / 2% female
- Confidence
- Medium (8 to 63 weighted country observations)
- Most common in
- Netherlands
- Data
- nam_dict (GFDL) + US SSA
- Updated
- 2026-09-11
How to address Koos
When you do not know their gender for certain, the full name with no title is the safe choice: "Dear Koos," in English, "Guten Tag Koos," in German. Koos is a male given name: about 98% of people named Koos are men. A quick look at a profile confirms it for certain.
Ready-made greetings in six languages
English
Dear Koos,
German
Guten Tag Koos,
French
Bonjour Koos,
Spanish
Estimado/a Koos:
Chinese
Koos您好：
Japanese
Koos様
English
Hi Koos,
German
Hi Koos,
French
Salut Koos,
Spanish
Hola Koos,
Chinese
Koos你好：
Japanese
Koosさん
This is a statistical estimate, not a statement about the gender, identity or correct form of address of any particular person.
Country breakdown
| Country | How common | Usually | Male share |
|---|---|---|---|
| Netherlands | uncommon | man's name | 98% |
Frequently asked questions
Is Koos a male or female name?
Koos is a male given name: 98% of people named Koos are men, and it is recorded as male in 1 of the 1 countries covered.
How do I address Koos in an email?
When you do not know their gender for certain, the full name with no title is the safe choice: "Dear Koos," in English, "Guten Tag Koos," in German. Koos is a male given name: about 98% of people named Koos are men. A quick look at a profile confirms it for certain.
Is Koos a unisex name?
Koos is not a unisex name: 98% of people named Koos are men. Koos leans strongly male overall.
Related names
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, public domain. Method: how we classify names. Full dataset: data & licences. Data built 2026-09-11.
DearWho, "Is Koos a male or female name?", https://dearwho.vercel.app/name/koos (accessed 2026-09-11). Data: nam_dict (J. Michael, GFDL) and US SSA, built 2026-09-11.
BibTeX
@misc{dearwho_koos,
title = {Is Koos a male or female name?},
author = {{DearWho}},
year = {2026},
url = {https://dearwho.vercel.app/name/koos},
note = {Data: nam_dict (GFDL), US SSA public domain}
}