In the world, Koetsu (Koetsu 
) is a very rare principally female, but scarcely masculine first name. The first name Koetsu is habitual in Eastern Asia, particularly China, where it is an extremely rare feminine name. Very seldom, Koetsu is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Koetsu | Brazil, China, United States, Japan |
| koetsu kudo Japanese entomologist, JP |
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| koetsu kon Japanese carcinologist, JP |
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| koetsu inoue researcher |
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