Well on the FF wiki they give the romaji as "raibura" which means the pronunciation, lie-bruh comes from "library" and not the scales, lee-bruh.
How many of you knew that? I only just found out and it blew my damn mind.
Forgot to give my own answer: I still keep saying "lee-bruh" despite being someone who consistently checks Japanese pronunciation when he's not sure. Saying that I also still say "Kwistis" instead of "Keestis" because I think it's a hilarious-sounding name.