Family name Brunai (Brunai 
) , across the world, is a rare surname. The surname Brunai is characteristic of Brunei, where it is quite a rare surname, Slovakia, and Estonia, where it is a rare surname. In absolute terms, it is commonest in Slovakia, Indonesia, and Brunei. Very seldom, Brunai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Brunai | Estonia, Brunei, Slovakia, Indonesia, Thailand |