Surname リドル (Riddle 
, Rydl 
, リドル) , in the world, is a common family name. The last name リドル is characteristic of the United States, where it is quite a rare surname, Czechia, and Australia. In absolute terms, the name is most common in the United States, the United Kingdom, and Australia. Very seldom, リドル is the forename as well as the last name.