By that logic, Dr. Van Helsing's descendant, also Van Helsing, also had his own game. 
Ha Ha! Hugh Jackman.
Actually in the movie Van Helsing, the titular character was supposed to be the angel Gabriel, and was implied to be thousands of years old. Apparently, one of the makers of the movie said they considered Gabriel Van Helsing to be Abraham's "kid brother" or something, but that obviously doesn't work with what they revealed of Gabriel's past in the movie itself.
And richter-zx, from what I've read, in the game of Bram Stoker's Dracula, you play as Jonathan Harker and not Quincy Morris anyway.
Also, I may have misunderstood you, but did you mean that Konami got their idea for Castlevania from the movie/game "Bram Stoker's Dracula", or from Bram Stoker's novel, "Dracula"? Because Castlevania predated "Bram Stoker's Dracula" by six years.
Maybe IGA's 8-bit game could be an adaptation of the novel?