Family name Ivash (Иваш 
, Ivash 
) , around the globe, is a rare surname. The last name Ivash is characteristic of Belarus, where it is a rare surname, Kyrgyzstan, where it is a very rare surname, and Kazakhstan. In absolute terms, it is commonest in Belarus, Russia, and the United States. Likewise, Ivash is the forename as well as the last name.