Family name ツォイ (Tsoi 
, Tsoy , Coj 
) , in all the world, is a common last name. The cognomen ツォイ is characteristic of Hong Kong, where it is a common surname, Bermuda, where it is quite a common surname, and Cayman Islands (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Hong Kong, Uzbekistan, and China. Likewise, ツォイ is the forename as well as the last name.