Cognomen Isaih (Isaih 
) , in the entire world, is a rare surname. The surname Isaih is characteristic of Sub-Saharan Africa, particularly Nigeria, where it is a rare surname, Tanzania, where it is a very rare surname, and South Africa, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Nigeria, Tanzania, and the United States. Also, Isaih is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Isaih | United States, Nigeria, Zimbabwe, South Africa, India |