Presumably a reference to the river in Lord of the Rings or the WoW character, though the relation to either is somewhat lost on me. It is a cool name though.
Edit: or I'm dumb and the author's name is Anduin.
Even after reading this comment I looked back because I really didn’t know what you were talking about, and only after reading the comment about “Anduin” did I realize there was no r in the name. Crazy.