All around the world, Sietske (Sietske 
) is a rare feminine first name. The first name Sietske is characteristic of Netherlands, where it is quite a rare girly name, Belgium, where it is a rare feminine name, and South Africa, where it is a very rare feminine name. Very seldom, Sietske is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Sietske | South Africa, United Kingdom, United States, Netherlands, Belgium |
| sietske abrahamszn. (b. 1842) |
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| sietske van der spoel Dutch Righteous Among the Nations, NL (b. 1877) |
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| sietske pasveer Dutch speed skater (1915-2001), NL (b. 1915) |
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sietske poepjes politician, NL (b. 1979) |
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sietske noorman Dutch sportsperson and athletics competitor, NL (b. 1991) |
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| sietske de jong NL (b. 1947) |
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| sietske tjallingii Dutch film director, NL (b. 1973) |
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| sietske waslander (b. 1966) |
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| sietske j batenburg researcher |
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| sietske h barnes researcher (ORCID 0000-0003-2029-749X) |
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| sietske m k bakker researcher (ORCID 0000-0003-4804-8348) |
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| sietske van berkel researcher |
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| sietske m grol researcher |
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| sietske romkema researcher (ORCID 0000-0002-5886-1036) |
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| sietske van viersen researcher |
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Mik, Venema, Westra, Schaper, Bergsma, Boersma, Brouwer, Ketelaar, Kuipers, Johnson, Joosten, Nichols, Elzinga, Feenstra, Wiersma, Zijlstra, Boonstra, Dijkstra, Terpstra, Hendriks, Hoekstra, Veenstra, Visser, Joustra, Jansma, Jansen, Bos, Wal, Meij, Smit, Bolt, Boer, Roos, Jong, Hoek, Veen, Plantinga, Bosma, Groen, Vries, Faber, Meulen, Mulder, Sijtsma, Bakker, Boomsma, Bierma, Postma, Kroon, and Vermaning