Hmm, always thought that the title was reference to THIS.

I think there is polearm sharing the name in ff11 too, sure, but I always found the keyblade's thematic similarity more poignant: Oathkeeper has been the light coloured and visually "good alignment" screaming kayblade of the KH seies since the first game, PLD is the "knight in shining armor" coded job of ff14.

I like the title, use it actually quite often and see nothing rotten in it. Obviously I am not from NA