Family name Ilavska (Ilavska 
) , all around the world, is a rare last name. The cognomen Ilavska is habitual in Slovakia, where it is quite a common surname, Czechia, where it is a rare surname, and New Zealand, where it is a very rare surname. In absolute terms, it most frequently occurs in Slovakia, Czechia, and Spain.
| VARIANT | COUNTRY |
|---|---|
| Ilavska | United Kingdom, Slovakia, Spain, New Zealand, Czechia |