Cognomen Wanichkaiwan (Wanichkaiwan 
) , in the world, is a very rare family name. The last name Wanichkaiwan is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Wanichkaiwan | Thailand |
Natcha, Areenit, Kanyamon, Wimonwan, Nuttayanee, and Thitiphong