Cognomen Sitinjak (Sitinjak 
) , in the entire world, is a common last name. The family name Sitinjak is characteristic of South-eastern Asia, particularly Indonesia, where it is quite a rare surname, Malaysia, where it is a rare surname, and Singapore. Much less frequently, Sitinjak is the forename as well as the last name.
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| Sitinjak | Indonesia, United Kingdom, Malaysia, Singapore, United States |
| galumbang c. sitinjak Indonesian politician (born 1959 in Laguboti), ID (b. 1959) |
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| bonar sitinjak ID (b. 1962) |
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| ricardo sitinjak ID (b. 1964) |
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| abraham benidiktus sitinjak ID (b. 1966) |
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| sahat martua sitinjak Indonesian political candidate, ID |
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| galumbang c. sitinjak Indonesian political candidate, ID |
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| sahala sitinjak Indonesian political candidate, ID |
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| ediartho sitinjak Indonesian political candidate, ID |
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| rita sitinjak Indonesian political candidate, ID |
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