Mordaunt

I wish that this were my surname - it's so Arthurian / Tennysonesque with a hint of the sinister

According to the internet: his surname is derived from a nickname. 'the biter.' The legend has ever been that this is the origin of this Norman name. Mr. Lower quotes that' Osbert le Mordaunt possessed Radwell, Bedfordshire, by gift of his brother, who had received it from the Conqueror for services rendered' (Pair.