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Re: meaning of name
It seems to be a rare male Catholic name. There is Saint Etherius who was Bishop of Lyons, and BtN says there were 3 others http://www.behindthename.com/namesakes/lists/saintalpha.phpI can't find any instances of Etherius as a female name, but there is a female equivalent Aetheria which is the name of one of the Heliades in Greek Mythology. I can't find a meaning but I would guess that it's related to the Greek Aether/Ether i.e. the upper atmosphere, sky
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