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Surname Jaz (Jaz , ジャズ , 洁丝 ) , around the world, is quite a rare family name. The cognomen Jaz is habitual in Brunei, where it is quite a rare surname, Qatar, and United Arab Emirates. In absolute terms, the name is most common in Morocco, Saudi Arabia, and Indonesia. More prevalently, Jaz is the forename as well as the last name.