Surname Йоо (Joo 
, Yoo , Ioo 
) , across the world, is a common family name. The cognomen Йоо is habitual in Malaysia, where it is quite a common surname, Hungary, and Egypt (explore the name in all countries). In absolute terms, this name is the most popular in Malaysia, Egypt, and the United States. Likewise, Йоо is the forename as well as the last name.