Across the world, Siep (Siep 
) is a rare principally boy's, but scarcely feminine first name. The first name Siep is characteristic of Western Europe, particularly Netherlands, where it is a rare principally masculine, but very seldom feminine name. More prevalently, Siep is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Siep | Belgium, Netherlands, Germany, Indonesia, United States |
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siep posthumus Dutch politician (1910-1987), NL (b. 1910) |
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siep benninga Dutch football player, NL (b. 1929) |
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siep de haan NL (b. 1958) |
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| siep martens NL (b. 1930) |
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| siep stuurman Dutch university teacher, NL (b. 1946) |
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| siep hoekstra NL (b. 1956) |
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| siep wouda researcher |
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| siep weiland Ph.D. Rijksuniversiteit Groningen 1991 |
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| siep van lingen |
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