Worldwide, Яак (Jaak 
, Yaak 
, Яак 
) is quite a rare boy's given name. The first name Яак is characteristic of Estonia, where it is quite a common masculine name, Belgium, where it is quite a rare masculine name, and Sweden, where it is a rare boy's name. Not in comparison with a country's population, it is commonest in Belgium, Estonia, and Algeria. Much less frequently, Яак is the last name as well as the forename.
| игнатси яак historical teacher in Estonia, EE (b. 1670) |
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кикас, яак вернерович Estonian physicist, EE (b. 1949) |
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яак тамм Estonian politician (1950-1999), EE (b. 1950) |
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| липсо, яак эдуардович Estonian basketball player, EE (b. 1940) |
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| яак тамлехт Estonian actor, EE (b. 1942) |
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| яак адамсон EE (b. 1938) |
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| салуметс, яак Estonian basketball player and politician, EE (b. 1949) |
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