Surname 西威 (Seii 
, 西威 ) , all around the world, is a rare cognomen. The last name 西威 is habitual in Kenya, where it is a rare surname, Japan, where it is a very rare surname, and Malaysia. In absolute terms, the name is most common in Kenya, Japan, and China. Much more prevalently, 西威 is the forename as well as the last name.