Last name Donnai (Donnai 
) , in all the world, is a very rare cognomen. The last name Donnai is habitual in Belgium, where it is a very rare surname, the United Kingdom, and Thailand. Much less frequently, Donnai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Donnai | Thailand, India, United Kingdom, United States, Belgium |
| dian donnai medical geneticist (b. 1945) |
|