Last name سيدل (Seidel 
, Seidl , سيدل) , across the world, is a widespread cognomen. The cognomen سيدل is characteristic of Austria, where it is quite a common surname, Germany, and Czechia. In absolute terms, the name is most common in Germany, the United States, and Austria. Very seldom, سيدل is the forename as well as the last name.