Around the world, Sietse (Sietse 
) is a rare masculine first name. The first name Sietse is characteristic of Netherlands, where it is quite a rare male name, Belgium, where it is a rare boy's name, and South Africa, where it is a very rare masculine name. Much less frequently, Sietse is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Sietse | South Africa, Canada, Netherlands, Belgium, Switzerland |
| sietse smeding Dutch editor, NL (b. 1830) |
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| sietse los ZA (b. 1871) |
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sietse bosgra NL (b. 1935) |
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sietse fritsma Dutch politician and civil servant, NL (b. 1972) |
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| sietse rienksma NL (b. 1915) |
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sietse van gorkom Dutch violinist, NL (b. 1981) |
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sietse bakker Dutch television executive, NL (b. 1984) |
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| sietse westra NL (b. 1927) |
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| sietse goverts Dutch painter, NL (b. 1947) |
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| sietse de vries Dutch writer, NL (b. 1955) |
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| sietse q nagelkerke researcher (ORCID 0000-0001-8359-4016) |
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| sietse m aukema researcher |
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| sietse ringers Ph.D. 2016 |
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| sietse t braakman researcher |
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| sietse wieringa researcher |
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Bos, Boersma, Brouwer, Damstra, Huisman, Verbeek, Vliegen, Willems, Wiersma, Wijbenga, Weening, Wolters, Bruinsma, Kooistra, Planting, Dijkstra, Terpstra, Hoekstra, Veenstra, Vogelzang, Hoogsteen, Van Der Wal, Wierda, Venema, Visser, Jouwsma, Wal, Meer, Smit, Boer, Dijk, Gans, Jong, Haan, Veen, Bouma, Van Der Meer, Groen, Nauta, Vries, Meijer, Bakker, Postma, Rozema, Dekker, Lolkema, Logger, Jansen, Jager, and Van Der Veen