Around the globe, Sjaak (Sjaak 
, Шак 
, سياك 
) is a rare boy's first name. The first name Sjaak is characteristic of Western Europe, particularly Netherlands, where it is quite a rare masculine name, and Belgium, where it is a rare masculine name. Very seldom, Sjaak is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sjaak | Germany, Czechia, United States, Netherlands, Belgium |
| Шак | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| سياك | Iran |
Sjaak is also a name for the fictitious and mythical characters: .
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sjaak köhler Dutch water polo player, NL (b. 1902) |
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sjaak boezeman Dutch resistance fighter during the Second World War, NL (b. 1914) |
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sjaak alberts Dutch association football player (1926-1997), NL (b. 1926) |
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| sjaak de koning Dutch speed skater, NL (b. 1885) |
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sjaak swart Dutch footballer, NL (b. 1938) |
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sjaak roggeveen Dutch football player, NL (b. 1942) |
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sjaak smetsers Dutch artist, NL (b. 1954) |
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sjaak van der tak Dutch politician, NL (b. 1956) |
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sjaak troost Dutch football player/director, NL (b. 1959) |
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sjaak neefjes university teacher at Leiden University, NL (b. 1959) |
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| sjaak vennekens Dutch politician (1909-1994), NL (b. 1909) |
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sjaak storm Dutch football player, NL (b. 1961) |
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sjaak bral Dutch writer and cabaret artist, NL (b. 1964) |
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sjaak simonse politician from the Netherlands, NL (b. 1972) |
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sjaak polak Dutch footballer/coach, NL (b. 1976) |
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De, Koning, Koster, Peters, Dekker, Linden, Jansen, Visser, Peeters, Derksen, Leeuwen, Janssen, Trekhaak, Willems, Schipper, Schouten, Bonestaak, Bonenstaak, Driessen, Thijssen, Hendriks, Vermeulen, Bakker, Verhoeven, Afhaak, Zwart, Bos, Kok, Der, Van, Wit, Smit, Berg, Boom, Boer, Bral, Blom, Dijk, Jong, Vink, Smits, Swart, Bruin, Pronk, Polak, Groot, Vries, Meijer, and Van Den Berg