Cognomen Иссаи (Issai 
, Иссаи 
) , across the world, is a rare last name. The family name Иссаи is characteristic of Oman, where it is a rare surname, Tanzania, and Mexico, where it is a very rare surname. In absolute terms, it is commonest in Mexico, Tanzania, and India. Likewise, Иссаи is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Issai | Oman, Tanzania, Mexico, India, Japan |
| Иссаи | Russia |