Last name Izaak (Исаак 
, Izaak 
, Изаак 
) , across the world, is quite a rare surname. The last name Izaak is characteristic of Armenia, where it is quite a common surname, Kazakhstan, where it is quite a rare surname, and Kyrgyzstan, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Indonesia, Russia, and Armenia. More prevalently, Izaak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Исаак | Kazakhstan, Armenia, Russia, Belarus, Lithuania |
| Izaak | Indonesia, South Africa, United States, Poland, Brazil |
| Изаак | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Ізаак | Ukraine |
Iiro, Iisakki, Ike, Isaac, Isaacus, Isaak, Isac, Isacco, Isak, Ishak, Issaak, Issac, Itzhak, Izaac, Izak, Izaák, Izaäk, Izsak, Izsák, Izák, Yitzhak, Айзек, Айк, Ике, Исаак, Айзек, Исаакий, Исаако, Исак, Исако, Исхак, Ицхак, Ісаак, Ісаакій, Ісак, Іцхак, אייזיק, יצחק, أوتو, إسحاق, إسحق, اسحاق, ايزاك, ইসহাক, アイク, イケ, and イサク
| tatyana izaak researcher |
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| roni izaak |
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