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Cognomen Yii (Yii ) , all around the world, is quite a common last name. The surname Yii is characteristic of South-eastern Asia, particularly Malaysia, where it is quite a common surname, Brunei, and Singapore, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Malaysia, Myanmar, and Australia. Very seldom, Yii is the forename as well as the last name.