Last name Туэн (Thouin 
, Туэн) , throughout the world, is quite a rare cognomen. The last name Туэн is characteristic of Canada, where it is quite a rare surname, France, and Switzerland, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in France, Canada, and the United States. Much less frequently, Туэн is the forename as well as the last name.