Sorry, but Im pretty certain its Alucard. Try spelling it backwards and see what you get. Now, try spelling Arkard backwards and well, it just doesn't really make much sense theme-wise to the series. Not as much as Alucard's does, anyway.Arkard (or Alucard as some think his name is, whatever floats your boat)
Yeah, and he's the main charater in Symphony of the Night. There are very obvious cues to SOTN in Hellsing. Well... the one I have in mind is mainly the end boss. Dracula's final form in SOTN is hilariously similar to Alucard's more advanced forms that he takes towards the end of Hellsing.Alucard is also the son of Dracula in the Castelvania games, if I remember correctly.