Yes and no.
the western authors had East European place names and origins for their inventions.
Transylvania, Vlad the Impaler (etc) for Vampires.
I would guess it's because these places and names are vague or completely unknown to most West Europeans allowing the authors huge amounts of freedom to fictionalise character development and events.
Yes and no. :)
As much as the part of EE being unknown for the westerners is true, the reason why Bram Stoker used Transylvania in his horror story about vampires was because it is the place of its origin (not Stokers of course but the figure of vampire as we know it today). The term vampire came most probably from the languages of western Slavs and spread all over eastern and central Europe.