Surname ยงวานิช (ยงวานิช 
, Yongwanich , Yongvanich 
) , in all the world, is a very rare cognomen. The last name ยงวานิช is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| ยงวานิช, Yongwanich | Thailand |
| Yongvanich | United States, Thailand |