I'm not sure Ayla's name is a mistranslation, actually.
I think that one is a Clan of the Cave Bear reference (the main character, a cavewoman, was named Ayla). "Ayla" was transliterated to "Eira" for the Japanese, but they kept the original when they translated to English.
I have no idea about the Epoch translation, though. Maybe "silvered" or "silverbird"?