Last name Иллеш (Illés 
, Illesh 
, Иллеш 
) , in the world, is quite a rare surname. The family name Иллеш is characteristic of Hungary, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Austria, where it is a rare surname. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Hungary, Slovakia, and Russia. Also, Иллеш is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Illés | Czechia, Austria, Hungary, Madagascar, Slovakia |
| Illesh | India, Russia, United States |
| Иллеш | Kazakhstan, Russia |
| Illeš | Croatia, Czechia |
Elia, Elias, Eliasz, Elie, Elies, Eliáš, Ellie, Elías, Ilias, Ilie, Ilija, Iliá, Ilja, Illech, Illes, Ilya, Élie, Ελίας, Ηλίας, Елиа, Илеш, Илиан, Илиас, Илие, Илия, Илија, Илко, Илчо, Илья, Эли, Элиа, Элиас, Элиаш, Ілля, Ілья, Іліас, איליה, אילש, אליאס, إليا, إلياس, إيلي, إيليا, ایلیا, خوسيه, イリアス, イリエ, イリヤ, エリ, エリア, エリアス, エリー, 埃利, 埃利亚斯, and 艾利