This family name in Transylvania, is as common as is "Smith" English-speaking countries, and my paternal grandfather (who was gassed in the Holocaust with his wife) took the name around the turn of the last century because his actual last name, "Ungar" (the German word for Hungarian is "Ungarn") was too Jewish for the Civil Servant that he was.
My mother, however, maiden name Récsei, is a true Székely, from Székelyföld ("Székely-land") in Transylvania, and her mother was of a family (Tökés) of some minor royalty.The Székelys are said to have already been in Transylvania when the Magyars arrived over a thousand years ago, and Bram Stoker was apparently so taken with us that he has Dracula speaking to Jonathan Harker early in Chapter 3 of the novel, referring to his (Dracula's) people as "We Székelys . . ."
While I have no personal knowledge of this, having arrived as an infant immigrant with my parents in 1949, I did have a bunch of Boy Scouts convinced that I was a real (if benevolent) vampire when I was their Senior Patrol Leader.When asked by one of them why he could see my reflection in the mirror, I replied that if we knew enough to get ready to send men to the moon, we had enough technology to allow people like me to hide in plain sight.