Bulgarian opposition calls Symeon .Saxkomburga.Opponents also.Fans call him Symeon -at least in Sadanski(town I was last weekend)
The patronyms are used by the most of slavian nations instead of use of the family name when they decided that the word Gospodin(sir) was too Borzoi and replace it with the word "Tavarish".So, family names was not even mentioned!That is to vanish all the old Russian family names from everyday's life!!