Cognomen Gaddi-Nguyen (Gaddi-Nguyen 
) , throughout the world, is an extremely rare last name. The cognomen Gaddi-Nguyen is habitual in Northern America, particularly the United States, where it is an extremely rare surname. Parts of the name also exists independently as a last name Gaddi, and a last name Nguyen.
| VARIANT | COUNTRY |
|---|---|
| Gaddi-Nguyen | United States |