Cognomen Gennadiou (Gennadiou 
) , in the entire world, is a rare last name. The last name Gennadiou is habitual in Cyprus, where it is quite a rare surname, Greece, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Gennadiou | United States, Cyprus, Greece |