Cognomen Исайя (Isaiah 
, Isaia 
, Isaiya 
) , around the globe, is a common last name. The last name Исайя is habitual in Vanuatu, where it is quite a common surname, Nigeria, and Cyprus. Measured by absolute frequency, it is the most numerous in Nigeria, Kenya, and Italy. Likewise, Исайя is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Isaiah | Nigeria, Ghana, United States, Kenya, South Africa |
| Isaia | Italy, Madagascar, Nigeria, United States, South Africa |
| Isaiya | India, Nigeria, United States, Nicaragua, South Africa |