Surname Th. (Богдан 
, Th. 
) , all around the world, is a common last name. The cognomen Th. is habitual in Eastern Europe, particularly Belarus, where it is quite a common surname, Ukraine, and Bulgaria (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus. More frequently, Th. is the forename as well as the last name.