Family name Ngadiah (Ngadiah 
) , around the world, is a very rare cognomen. The cognomen Ngadiah is characteristic of South-eastern Asia, particularly Indonesia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Very seldom, Ngadiah is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ngadiah | Malaysia, Indonesia |