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I'd say air-YON-a, although as Llewella said it would vary, depending on which part of Wales you're from. I haven't seen it before, although I've come across a few Eifionas. 'eirian' is a word meaning either bright or beautiful, but it could also be related to 'eira', meaning snow. The -a ending is borrowed from English, so I think I'd prefer Eirion or Eirian.