Gaius
Gaius is a male given name: 100% of people named Gaius are men, and it is recorded as male in 1 of the 1 countries covered.
We have limited data on this name. Treat the verdict as a lead, not a certainty.
- Verdict
- Male
- Male / female split
- 100% male / 0% female
- Confidence
- Low (fewer than 8 weighted country observations)
- Most common in
- United States
- US births since 1880
- 336 male / 0 female
- Data
- nam_dict (GFDL) + US SSA
- Updated
- 2026-09-11
How to address Gaius
When you do not know their gender for certain, the full name with no title is the safe choice: "Dear Gaius," in English, "Guten Tag Gaius," in German. Gaius is a male given name: about 100% of people named Gaius are men. A quick look at a profile confirms it for certain.
Ready-made greetings in six languages
English
Dear Gaius,
German
Guten Tag Gaius,
French
Bonjour Gaius,
Spanish
Estimado/a Gaius:
Chinese
Gaius您好：
Japanese
Gaius様
English
Hi Gaius,
German
Hi Gaius,
French
Salut Gaius,
Spanish
Hola Gaius,
Chinese
Gaius你好：
Japanese
Gaius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 |
|---|---|---|---|
| United States | rare | man's name | 100% |
United States birth data
336 male · 0 female · 336 births recorded
Since 1980: 100% male.
Frequently asked questions
Is Gaius a male or female name?
Gaius is a male given name: 100% of people named Gaius are men, and it is recorded as male in 1 of the 1 countries covered.
How do I address Gaius in an email?
When you do not know their gender for certain, the full name with no title is the safe choice: "Dear Gaius," in English, "Guten Tag Gaius," in German. Gaius is a male given name: about 100% of people named Gaius are men. A quick look at a profile confirms it for certain.
Is Gaius a unisex name?
Gaius is not a unisex name: 100% of people named Gaius are men. Gaius 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 Gaius a male or female name?", https://dearwho.vercel.app/name/gaius (accessed 2026-09-11). Data: nam_dict (J. Michael, GFDL) and US SSA, built 2026-09-11.
BibTeX
@misc{dearwho_gaius,
title = {Is Gaius a male or female name?},
author = {{DearWho}},
year = {2026},
url = {https://dearwho.vercel.app/name/gaius},
note = {Data: nam_dict (GFDL), US SSA public domain}
}