Worldwide, Issaia (Issaia 
) is a very rare gender-neutral forename. The forename Issaia is characteristic of South Africa, where it is a very rare boy's name, and India, where it is an extremely rare unisex name. Also, Issaia is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Issaia | Nigeria, Australia, France, South Africa, India |