june 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