Surname シンク (Cinque 
, Sink 
, Cink 
) , in the entire world, is a common last name. The cognomen シンク is habitual in Slovenia, where it is quite a common surname, Estonia, and Italy, where it is quite a rare surname. In absolute terms, it is commonest in the United States, Italy, and Czechia. Much less frequently, シンク is the forename as well as the last name.