Surname Детлеф (Detlef 
, Детлеф 
, Dettlef 
) , throughout the world, is quite a rare family name. The last name Детлеф is characteristic of Oman, where it is quite a rare surname, Germany, where it is a rare surname, and Spain. In absolute terms, the name is most common in Germany, Spain, and the United States. Much more frequently, Детлеф is the forename as well as the last name.