Surname Kwansai (Kwansai 
) , in all the world, is a very rare family name. The family name Kwansai is habitual in Thailand, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. Also, Kwansai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kwansai | Nigeria, Thailand |