Surname กาญจนรัตน์ (กาญจนรัตน์ 
, Kanjanarat 
, Kanchanarat 
) , all around the world, is quite a rare family name. The cognomen กาญจนรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname. Also, กาญจนรัตน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| กาญจนรัตน์, Karnjanarat | Thailand |
| Kanjanarat | United States, Thailand |
| Kanchanarat | United Kingdom, Thailand |
Ganjanarat, Kanchanarath, Kanchanaratn, Kanhanarat, Kanjanaratt, Kanjanrat, Kanjarath, and Karnchanarat
| สุรศักดิ์ กาญจนรัตน์ Thai soldier, TH (b. 1954) |
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