Cognomen Isiu (Isiu 
) , around the world, is a very rare last name. The cognomen Isiu is habitual in Albania, where it is quite a rare surname, Greece, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Albania, Nigeria, and China. Likewise, Isiu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Isiu | Greece, Albania, India, Nigeria, China |