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After the creation of Scarlet, the Blood Manor, the Blood Progenitor reacted to its creation with awe, remembering the "necromancy" that those of a family of vampires wielded within his original world, the world of Vampires, Abyss.
And Noah as the shrewd man he was, immediately decided to extract such info from him, even if it would take a while for him to travel to Abyss, to begin with.
"The world of Abyss has three different continents separated by the abyssal miasma sea… I inhabited the Arteria Continent… There, three Families of Vampires are the strongest of them all and govern the rest of the races living within such places. I once belonged to the Dracul Family, but I separated myself from those old men because I wanted to walk my own path," sighed the Blood Progenitor.
"Oh, so your surname is Dracul! Then calling you Dracula is really not so bad," laughed Noah.
Check "The Protagnist's Sister Is Actually the Strongest"!