Last name Semeon (Семён 
, Semeon 
, Семеон 
) , in all the world, is quite a rare surname. The last name Semeon is characteristic of Belarus, where it is a rare surname, Russia, and Kyrgyzstan. Not in comparison with a country's population, it is the most numerous in Russia, Ethiopia, and Nigeria. More prevalently, Semeon is the forename as well as the last name.