Isao
Isao is a male given name: 98% of people named Isao are men, and it is recorded as male in 2 of the 2 countries covered.
- Verdict
- Male
- Male / female split
- 98% male / 2% female
- Confidence
- Medium (8 to 63 weighted country observations)
- Most common in
- Japan, United States
- US births since 1880
- 246 male / 0 female
- Data
- nam_dict (GFDL) + US SSA
- Updated
- 2026-09-11
How to address Isao
When you do not know their gender for certain, the full name with no title is the safe choice: "Dear Isao," in English, "Guten Tag Isao," in German. Isao is a male given name: about 98% of people named Isao are men. A quick look at a profile confirms it for certain.
Ready-made greetings in six languages
English
Dear Isao,
German
Guten Tag Isao,
French
Bonjour Isao,
Spanish
Estimado/a Isao:
Chinese
Isao您好：
Japanese
Isao様
English
Hi Isao,
German
Hi Isao,
French
Salut Isao,
Spanish
Hola Isao,
Chinese
Isao你好：
Japanese
Isao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 |
|---|---|---|---|
| Japan | uncommon | man's name | 98% |
| United States | rare | man's name | 100% |
United States birth data
246 male · 0 female · 246 births recorded
Since 1980: 100% male.
Frequently asked questions
Is Isao a male or female name?
Isao is a male given name: 98% of people named Isao are men, and it is recorded as male in 2 of the 2 countries covered.
How do I address Isao in an email?
When you do not know their gender for certain, the full name with no title is the safe choice: "Dear Isao," in English, "Guten Tag Isao," in German. Isao is a male given name: about 98% of people named Isao are men. A quick look at a profile confirms it for certain.
Is Isao a unisex name?
Isao is not a unisex name: 98% of people named Isao are men. Isao 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 Isao a male or female name?", https://dearwho.vercel.app/name/isao (accessed 2026-09-11). Data: nam_dict (J. Michael, GFDL) and US SSA, built 2026-09-11.
BibTeX
@misc{dearwho_isao,
title = {Is Isao a male or female name?},
author = {{DearWho}},
year = {2026},
url = {https://dearwho.vercel.app/name/isao},
note = {Data: nam_dict (GFDL), US SSA public domain}
}