Family name Ильган (Ильган 
, Ilgan 
) , worldwide, is a very rare cognomen. The cognomen Ильган is habitual in Turkey, where it is a rare surname, Georgia, where it is a very rare surname, and Germany, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Turkey, Germany, and Philippines. Very seldom, Ильган is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ильган | Russia |
| Ilgan | Georgia, Germany, Philippines, Turkey |