Surname ダイカ (Dajka 
, ダイカ) , all over the world, is quite a rare cognomen. The family name ダイカ is characteristic of Eastern Europe, particularly Hungary, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Poland, where it is a rare surname. Very seldom, ダイカ is the forename as well as the last name.