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Cognomen Xa (茶 , Xa , Xá ) , around the globe, is a common last name. The family name Xa is characteristic of Macao, where it is quite a common surname, Maldives, where it is quite a rare surname, and Myanmar. Measured by absolute frequency, this name is the most popular in China, Myanmar, and Vietnam. Likewise, Xa is the forename as well as the last name.