A little advice when thinking of names, is to try and think of what the character does, what they're like. Like your character is a dark assassin which leads me to think of something dark and ominous, so I thought Raven, then replaced the E with an A giving me Ravan, Harethi is an anagram of hate with some other random letters added in to give it a sort of Dunmer twist

Other examples, are an imperial bounty hunter I had, who had very dark black hair, so I named him "Drakus Lakrome (Drake is latin for Dragon, the symbol of the empire) and Lakrome comes from his dark hair colour (Chrome) the "La" is just to make it sound fancy as all imperials think they are lol