Surname Исмоилжан (Исмоилжан 
) , worldwide, is a very rare family name. The cognomen Исмоилжан is characteristic of Kyrgyzstan, where it is a rare surname, and Russia, where it is an extremely rare surname. More prevalently, Исмоилжан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Исмоилжан | Kyrgyzstan, Kazakhstan, Russia |