Cognomen ツァイ (Tsai 
, ツァイ 
) , around the globe, is a common surname. The surname ツァイ is characteristic of Taiwan, where it is a common surname, Cayman Islands, and Bermuda, where it is quite a common surname (explore the name in all countries). In absolute terms, it is commonest in Taiwan, the United States, and China. Much less frequently, ツァイ is the forename as well as the last name.