Family name Йеф (Jef 
, Йеф) , globally, is quite a rare last name. The family name Йеф is habitual in Brunei, where it is quite a rare surname, Belgium, and Bahrain, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Indonesia, Belgium, and Saudi Arabia. More prevalently, Йеф is the forename as well as the last name.