Cognomen Isaac Isai (Isaac Isai 
) , all around the world, is an extremely rare family name. The surname Isaac Isai is habitual in Latin America and the Caribbean, particularly Chile, where it is a very rare surname. More prevalently, Isaac Isai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Isaac Isai | Peru, Ecuador, Chile, Costa Rica |