Board Thread:Questions and Answers/@comment-69.140.66.58-20151218225802/@comment-2601:800:C200:5:30A9:AFDB:AC55:1EF8-20180201123312

The sword hasn't been named. But the author thought about calling it the Obsidian Slasher, or Mother's Rosario xD. Obsidian Slasher might be good because Yuuki is all purple. So is her chest armor, it's made of Obsiidian. But it might be called something else later on the series. A lot of ALO Swords haven't been named. Like Asuna's ALO Sword, Kirito's ALO 2 Swords, Klein's Katana, Silica's Knife, Lizbeth's Mace, Leafa's Sword, and Yuuki's Sword. So it doesn't matter if we'll ever see what the name of those swords are now because they are busy on making Sword Art Online: Projection Alicization. But maybe we will.