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Surname Hainz (Haiz
, Hainz
) , all over the world, is quite a rare cognomen. The last name Hainz is habitual in Austria, where it is quite a rare surname, Germany, and Slovenia, where it is a rare surname. In absolute terms, it is commonest in Germany, Austria, and Italy. Much less frequently, Hainz is the forename as well as the last name.