Last name スイ (Sui 
, スイ ) , globally, is a widespread cognomen. The surname スイ is habitual in Mongolia, where it is a widespread surname, Malaysia, where it is quite a common surname, and Cayman Islands (explore the name in all countries). In absolute terms, it most frequently occurs in China, Mongolia, and Malaysia. Much less frequently, スイ is the forename as well as the last name.