Family name Izu-Nai (Izu-Nai 
) , worldwide, is a rare last name. The family name Izu-Nai is habitual in Eastern Asia, particularly Japan, where it is a rare surname. Parts of the name also exists independently as a first name Izu, and a last name Nai.
| VARIANT | COUNTRY |
|---|---|
| Izu-Nai | Japan |