Cognomen צוי (Tsoi 
, Coj 
, צוי 
) , throughout the world, is a common last name. The surname צוי is habitual in 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). Not in comparison with a country's population, it is the most numerous in Hong Kong, China, and Guatemala. Likewise, צוי is the forename as well as the last name.