Surname Isak (Isak 
, יצחק , Исак 
) , globally, is a common family name. The cognomen Isak is habitual in Somalia, where it is quite a common surname, Israel, and North Macedonia (explore the name in all countries). Measured by absolute frequency, it is commonest in Somalia, India, and Israel. More frequently, Isak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Isak | Israel, Indonesia, India, South Africa, Somalia |
| יצחק | Israel |
| Исак | Bulgaria, Kazakhstan, Kyrgyzstan, Armenia, Russia |
| イサク | Japan |
Icchak, Iiro, Iisaaq, Iisak, Iisakki, Ike, Isaac, Isaach, Isaacus, Isaak, Isac, Isacco, Isach, Ishak, Issaak, Issac, Itshak, Itzhak, Izaac, Izaak, Izak, Izsak, Izsák, Içak, Jicchak, Yitshak, Yitzhak, Ísak, Айзек, Айк, Изаак, Ике, Исаак, Исаак, Айзек, Исаако, Исако, Исакь, Исақ, Исхак, Ицхак, Ицхок, Ісаак, Ісак, Іцхак, אייזיק, אייק, איסק, أوتو, إسحاق, إسحق, اسحاق, ايزاك, ايساك, ইসহাক, ိးသက္, アイク, イケ, イサキ, 池, and 이삭
| sara isak holocaust victim, b. 1860-03-12, AT (b. 1860) |
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| moritz isak holocaust victim, b. 1871-06-12, AT (b. 1871) |
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| siegfried isak holocaust victim, b. 1871-03-03, DE (b. 1871) |
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alexander isak Swedish association football player, SE (b. 1999) |
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| hubert isak (b. 1955) |
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| priidu isak EE (b. 1957) |
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| rainer isak (b. 1958) |
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| gita isak actor |
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| ilena isak researcher |
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| stanislav isak Slovene police officer, SI |
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