Hey, I know. Lets not be consistent with the naming of the summons, even within our own translation. And if you think it was mistranslated, say so. At the beginning of the chapter. That way readers aren't going, who?
Lai or Ray (yes, I know L and R sounds are interchangeable, still. Pick one, stick with it)
Muscle Head(!?) or DukDae
at least the cute angry turtle's name is consistent.