Family name Kanjanathorn (Kanjanathorn 
) , across the world, is an extremely rare last name. Much more frequently, Kanjanathorn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kanjanathorn | Thailand |
Seingchin, Siengchin, Siangchin, Chiangchin, and Chiengchin