Bram Stoker drew on numerous sources when crafting his novel DRACULA. It’s possible that the legend of Abhartach, an Irish dwarf (or alternately a giant) who was a sorcerer in life and returned from the dead after being slain by the hero Fionn Mac Cumhail, who had to kill the revenant two more times and bury him upside down to finally put a stop to Abhartach’s predations, was one of those sources. The tale of Abhartach sure sounds like a vampire story, and it’s perfectly plausible that Stoker heard it, and that there might be reflections of Abhartach in Count Dracula, but there is no direct connection.
Fionn Mac Cumhail, by the way, is actually pronounced “Finn McCool”. That’s the maddening things about Old Gaelic; nothing is pronounced the way it is spelled. The fact that Abhartach was called in that language “fear an drach fhola”, or “man of bad blood”, and that “drach fhola” is pronounced “drock-ola”, is just coincidence—or serendipity. There’s lots of serendipity where Dracula is concerned, such as the fact that the physical description of Count Dracula provided by Bram Stoker in the novel is uncannily similar to the extant painting of the historical Vlad Dracula, and this despite the fact that Stoker had never seen that painting!