Family name Сэпп (Sepp 
, Сэпп 
) , globally, is quite a common surname. The family name Сэпп is habitual in Estonia, where it is a common surname, Austria, where it is quite a rare surname, and Slovakia. Not in comparison with a country's population, this name is the most popular in Estonia, Germany, and the United States. Likewise, Сэпп is the forename as well as the last name.