Cerberus
Cerberus was the three-headed watchdog with a serpent body that guarded the entrance to Hades in Greek/Roman mythology.
Cacus
In Roman mythology, Cacus, the son of Vulcan, was a giant who lived in a cave on Mount Aventine.
Astarte
Astarte/Astarot is derived from Ashtoreth of 1 Kings 11:5 "the goddess of the Sidonians."
Callicantzaros
Greek vampires that would feed on children born around Christmas time.
Vrykolakas
The Greek equivalent of the Slavic/European vampire was called the "vrykolakas" derived form the older Slavic term "vblk'b dlaka", meaning wolf pelt wearer.