Family name Мацуи (Matsui 
, Matsuy 
, Macui 
) , all over the world, is quite a common surname. The family name Мацуи is habitual in Singapore, where it is quite a rare surname, Japan, and Hong Kong, where it is a rare surname. Not in comparison with a country's population, the name is most common in Japan, Brazil, and the United States. Likewise, Мацуи is the forename as well as the last name.