` June 2009 (UTC)  :Yes, that etymology does trace to linguistic literature, though it's not often quoted. I don't know if Poseidon is included, but Mygdonia I've seen it included, with a possible meaning of ``swampy/wet land`` (PIE *meug-, ``wet, slippery``; the river mouths & lakes there or that were there etc.), or so I remember. Macedon on its own didn't look like much of a case and Poseidon as ``earthman`` sounds like a wild speculation, but Mygdonia does seem to fit well.   21:36, 24`