Family name Siep (Siep 
) , across the world, is a rare last name. The family name Siep is habitual in Netherlands, where it is quite a rare surname, Latvia, where it is a rare surname, and Germany. Measured by absolute frequency, it most frequently occurs in Netherlands, Germany, and Indonesia. Very seldom, Siep is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siep | Germany, Indonesia, Belgium, United States, Netherlands |
| willem frederik siep Dutch conductor, composer, pianist and musicologist (1866-1926), NL (b. 1866) |
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ludwig siep German philosopher, DE (b. 1942) |
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| nicolette siep researcher (ORCID 0000-0002-0326-2933) |
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| traute siep |
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