Last name Janthop (Janthop 
) , in the entire world, is a very rare cognomen. The surname Janthop is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Janthop | Thailand |
Kanokorn, Kittipan, Ritthikrai, Janthraporn, and Jeeraphong