Surname Исак (Isaac 
, Isak , Исак 
) , all around the world, is a widespread cognomen. The family name Исак is characteristic of Israel, where it is a widespread surname, Antigua and Barbuda, where it is a common surname, and Saint Kitts and Nevis (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Nigeria, Mexico, and Ghana. Likewise, Исак is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Isaac, Isak | Kenya, Mexico, Ghana, Nigeria, United States |
| Исак | Kazakhstan, Armenia, Russia, Kyrgyzstan, Bulgaria |
Icchak, Iiro, Iisakki, Ike, Is., Isaach, Isaack, Isaak, Isac, Isacco, Isach, Isaq, Ishak, Ishaq, Issaak, Issac, Itshak, Itzhak, Izaac, Izaak, Izak, Izsak, Izsák, Jicchak, Yitshak, Yitzhak, Ísak, Айзек, Айк, Изаак, Ике, Исаак, Исаак, Айзек, Исаако, Исако, Исхак, Ицхак, Ицхок, Ісаак, Ісак, Іцхак, אייזיק, יצחק, أوتو, إسحاق, إسحق, اسحاق, ايزاك, ইসহাক, アイク, イケ, and イサク