This is no contest, it's The Sword of the Morning. That's one of the best nicknames of all time, in anything, it just is.
Daenerys Targaryen, Stormborn, the Unburnt, Mother of Dragons, Khaleesi of the Dothraki, Trueborn Queen of the Andals, Rhoynar, and the First Men, and Rightful Ruler of the Seven Kingdoms.
Sword of the Morning, Darkstar, Whoresbane are all fantastic. Also think Little Grandfather is funny.
blackfish has a nice ring to it, but its hard to beat out Sword of the Morning and Darkstar. I named my penis Whoresbane in college. woat nickname? mother of dragons, followed closely by balon calling King Robb the young pup... pissed me off.
Sword of the morning is great but also all the Blackfyres had great names: Bittersteel and Bloodraven
Spoiler idk i just like her voice a lot and i just got to the chapter in SOS where she's patronizing him in the cell. good scene.
To go in a slightly different route, what's the best sword name in the series? I like Red Rain (don't remember whose sword that was, it was in some anecdote in book 3 or 4).