Cognomen Трокель (Trockel 
, Трокель 
) , all over the world, is a rare family name. The cognomen Трокель is characteristic of Germany, where it is a rare surname, Belarus, and Finland, where it is a very rare surname. In absolute terms, it is commonest in Germany, the United States, and Belarus. Very seldom, Трокель is the forename as well as the last name.