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Cognomen Isaác (Исаак
, איסאק
, Isaác
) , around the world, is a rare surname. The cognomen Isaác is characteristic of Armenia, where it is quite a common surname, Kyrgyzstan, where it is a rare surname, and Kazakhstan. Not in comparison with a country's population, this name is the most popular in Armenia, Russia, and Kazakhstan. More frequently, Isaác is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Исаак | Kazakhstan, Russia, Lithuania, Belarus, Armenia |
| איסאק | Israel |
| Isaác | Mexico |