Throughout the world, Siahaan (Siahaan 
) is a rare unisex first name. The first name Siahaan is habitual in South-eastern Asia, particularly Indonesia, where it is a rare unisex name. Predominantly, Siahaan is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Siahaan | Malaysia, Australia, United States, Singapore, Indonesia |
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fransen g. siahaan Indonesian politician (born 1958 in Medan), ID (b. 1958) |
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| pataniari siahaan Indonesian politician (born 1946), ID (b. 1946) |
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| semsar siahaan Indonesian painter (1952-2005), ID (b. 1952) |
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| carter p siahaan Indonesian politician (born 1978 in Jakarta), ID (b. 1978) |
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| tio serepina siahaan ID (b. 1968) |
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| timbo p. siahaan Indonesian political candidate, ID |
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| lince tampubolon siahaan Indonesian political candidate, ID |
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| walman siahaan Indonesian political candidate, ID |
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| siska arie santy siahaan botanist |
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| humala b. siahaan Indonesian political candidate, ID |
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| firman a. siahaan Indonesian political candidate, ID |
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| sulastri siahaan Indonesian political candidate, ID |
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| bona ricki jeferson siahaan Indonesian politician (born 1988 in Singkawang), ID (b. 1988) |
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| firman siahaan |
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| re siahaan ID |
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