Family name צאי (Tsai 
, צאי 
) , around the world, is a common last name. The last name צאי 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 the most numerous in Taiwan, the United States, and China. Much less frequently, צאי is the forename as well as the last name.