Cognomen Siagian (Siagian 
) , around the world, is a common surname. The cognomen Siagian is habitual in South-eastern Asia, particularly Indonesia, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Singapore, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Indonesia, Malaysia, and the United States.
| VARIANT | COUNTRY |
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| Siagian | Australia, Singapore, United States, Indonesia, Malaysia |
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burhanuddin siagian ID (b. 1955) |
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| gajus siagian (b. 1920) |
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| sabam siagian Indonesian journalist (1932-2016), ID (b. 1932) |
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| darwin siagian Indonesian politician, ID (b. 1952) |
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| ian p. siagian Indonesian politician (born 1952), ID (b. 1952) |
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| ramson siagian Indonesian politician, ID (b. 1957) |
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| parlindungan siagian Indonesian politician (born 1960 in Pulau Siantar), ID (b. 1960) |
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| rizaldi siagian ID (b. 1951) |
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| harry parulian siagian ID (b. 1952) |
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| sihol siagian ID (b. 1954) |
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| ferdinand siagian ID (b. 1959) |
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| sahat siagian ID (b. 1961) |
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| r.d. naulita d. siagian Indonesian politician (born 1974 in Jakarta), ID (b. 1974) |
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| linda siagian researcher |
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| ria christine siagian researcher (ORCID 0000-0002-9037-6831) |
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