Around the world, Siagian (Siagian 
) is a rare unisex given name. The first name Siagian is habitual in South-eastern Asia, particularly Indonesia, where it is a rare epicene name. Predominantly, Siagian is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Siagian | Australia, Singapore, United States, Indonesia, Malaysia |
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bachtiar siagian Indonesian actor, ID (b. 1923) |
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| rio sahala siagian Indonesian politician (born 1978), ID (b. 1978) |
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| firman siagian Indonesian singer, ID (b. 1978) |
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| loly r d siagian researcher (ORCID 0000-0002-6942-4819) |
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| aris azhari siagian Indonesian political candidate, ID |
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| robinson togap siagian Indonesian political candidate, ID |
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| muliati siagian Indonesian political candidate, ID |
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| dera siagian Indonesian actress, ID (b. 1993) |
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