Family name Illesova (Illesova 
) , in the entire world, is a rare surname. The surname Illesova is characteristic of Slovakia, where it is quite a rare surname, Malta, and Czechia, where it is a rare surname. Measured by absolute frequency, it is commonest in Slovakia, Czechia, and Spain.
| VARIANT | COUNTRY |
|---|---|
| Illesova | Czechia, Malta, Spain, Slovenia, Slovakia |