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Last name Tangi (Tang , Tangi , Tank ) , around the world, is a prevalent surname. The last name Tangi is characteristic of Hong Kong, where it is a prevalent surname, Cayman Islands, where it is a widespread surname, and Macao (explore the name in all countries). Not in comparison with a country's population, the name is most common in China, Hong Kong, and the United States. Much less frequently, Tangi is the forename as well as the last name.