Cognomen Engsai (Engsai 
) , in the world, is an extremely rare last name. The cognomen Engsai is characteristic of South-eastern Asia, particularly Malaysia, where it is an extremely rare surname, and Thailand. Very seldom, Engsai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Engsai | Canada, Malaysia, Thailand |