Off of the top of my head, here are some unique melee weapons: 2076 World Series Baseball Bat Furious Power Fist Deathclaw Gauntlet Grognak's Axe Big Jim General Chao's Revenge Pickman's Blade Rockville Slugger Shem Drowne's Sword Shishkebab Kremvh's Tooth And, there's a unique power armor arm called Tessa's Fist you might want if you're doing a melee build.