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Family name אוי (Ui , Hui-Lan , אוי ) , in all the world, is quite a common surname. The cognomen אוי is characteristic of Macao, where it is quite a rare surname, Malaysia, and Oman, where it is a rare surname. In absolute terms, this name is the most popular in Indonesia, Malaysia, and China. Also, אוי is the forename as well as the last name.