Surname Lengai (Lengai 
) , throughout the world, is a rare family name. The surname Lengai is habitual in Tanzania, where it is quite a rare surname, Malaysia, where it is a very rare surname, and South Africa, where it is an extremely rare surname. Likewise, Lengai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lengai | Tanzania, Malaysia, India, Thailand, South Africa |