Last name Isaak (יצחק 
, Isaak 
, Исаак 
) , in all the world, is a common surname. The family name Isaak is habitual in Israel, where it is quite a common surname, Namibia, and Greece (explore the name in all countries). In absolute terms, it is commonest in Israel, Greece, and Germany. More prevalently, Isaak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| יצחק | Israel |
| Isaak | Germany, Namibia, Greece, Mexico, United States |
| Исаак | Kazakhstan, Belarus, Armenia, Russia, Lithuania |
| إسحاق | Egypt, Algeria, Yemen, Sudan, Iraq |
Icchak, Iiro, Iisakki, Ike, Isaac, Isaach, Isaacus, Isac, Isacco, Isach, Isak, Isaák, Ishak, Issaak, Issac, Itzhak, Izaac, Izaak, Izak, Izsak, Izsák, Izák, Yitzhak, Айзек, Айк, Изаак, Ике, Исаак, Айзек, Исаако, Исак, Исако, Исхак, Ицхак, Ісаак, Ісак, Іцхак, אייזיק, אייק, איסאק, أوتو, إسحق, اسحاق, اسحق, ايزاك, ايساك, ইসহাক, อิซาค, アイク, イケ, イサアキ, イサク, and 池
| meir ben isaak (b. 1050) |
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| efraim ben isaak DE (b. 1110) |
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henricus isaak Franco-Flemish Renaissance composer, VA (b. 1450) |
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| stephan isaak DE (b. 1542) |
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aaron isaak Swedish businessman, DE (b. 1730) |
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| moses isaak (b. 1720) |
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| dirk isaak (b. 1800) |
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juliusz isaak PL (b. 1870) |
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| jonathan ben abraham isaak (b. 1824) |
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| abraham isaak Publisher, editor, anarchist (b. 1856) |
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| elise isaak holocaust victim, b. 1862-10-23, DE (b. 1862) |
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| emma isaak holocaust victim, b. 1866-04-25, DE (b. 1866) |
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| samuel isaak holocaust victim, b. 1869-02-18, DE (b. 1869) |
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| karoline isaak holocaust victim, b. 1870-05-04, DE (b. 1870) |
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| william isaak, jr. American politician, US (b. 1876) |
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