Worldwide, Sietze (Sietze 
) is a rare masculine forename. The given name Sietze is habitual in Western Europe, particularly Netherlands, where it is a rare masculine name. Much less frequently, Sietze is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Sietze | Netherlands, Belgium, China, United States, Spain |
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sietze douwes van veen Dutch theologian (1856-1924), NL (b. 1856) |
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sietze de groot Dutch speed skater, NL (b. 1917) |
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| sietze albert veenstra Dutch architect, NL (b. 1897) |
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| sietze romkes Dutch Righteous Among the Nations, NL (b. 1904) |
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| sietze akkerman Dutch Righteous Among the Nations, NL (b. 1915) |
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| sietze haarsma Dutch rower, NL (b. 1926) |
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| sietze visser Dutch football player, NL (b. 1946) |
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| sietze veen Dutch football player, NL (b. 1946) |
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| sietze dolstra Dutch singer and cabaret artist (1946-2015), NL (b. 1946) |
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| sietze de vries Dutch organist (b. 1973) |
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| sietze j de graaff researcher |
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| sietze hof Ph.D. Rijksuniversiteit Groningen 1940 |
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| sietze schukking Dutch politician, NL |
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| sietze vellema researcher, ORCID id # 0000-0002-6476-4558 |
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| sietze jan dijkstra Dutch politician, NL |
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Vis, Bijlsma, Keuning, Hamstra, Haarsma, Vliegen, Feenstra, Wiersma, Wolters, Albertse, Boonstra, Koopmans, Planting, Dijkstra, Nikolaas, Holwerda, Hoekstra, Veenstra, Veenhuizen, Wiebenga, Greidanus, Vanderheide, Braaksma, Bergsma, Snijder, Sietzema, Vos, Wal, Boer, Dijk, Jong, Haan, Veen, Vonk, Bouma, Bosma, Van Der Wal, Pries, Vries, Faber, Meijer, Mulder, Bakker, Pekema, Rozema, Greijdanus, Hokwerda, Visser, Heide, and Van Der Heide