Family name Исмаилжан (Исмаилжан 
) , worldwide, is a rare cognomen. The cognomen Исмаилжан is habitual in Kyrgyzstan, where it is quite a rare surname, and Russia, where it is an extremely rare surname. More frequently, Исмаилжан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Исмаилжан | Russia, Azerbaijan, Kazakhstan, Kyrgyzstan |