Cognomen กุลดิลก (กุลดิลก 
) , worldwide, is a rare last name. The cognomen กุลดิลก is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, กุลดิลก is the forename as well as the last name.
| ชัจจ์ กุลดิลก Thai politician, TH (b. 1943) |
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| จารุพรรณ กุลดิลก Thai politician, TH (b. 1973) |
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| ปิติพงษ์ กุลดิลก Thai footballer, TH (b. 1980) |
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