Origin of erne
- Middle English ern eagle from Old English earn or- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle English ern, erne, earn, from Old English earn (“eagle”), from Proto-Germanic *arô (“eagle”), from Proto-Indo-European *or- (“large bird, eagle”). Cognate with Dutch and Low German arend (“eagle”), Danish ørn (“eagle”), Swedish örn (“eagle”), German Aar (“eagle”), Ancient Greek ὄρνεον (orneon), ὄρνις (órneon, órnis, “bird”).