Cognomen Илиаев (Илиаев 
, Iliaev 
) , globally, is a very rare family name. The cognomen Илиаев is habitual in Greece, where it is a rare surname, Czechia, and Russia, where it is a very rare surname. In absolute terms, it is commonest in Russia, Germany, and Greece.
| VARIANT | COUNTRY |
|---|---|
| Илиаев | Russia |
| Iliaev | Germany, Czechia, Canada, Greece, France |