Ahhh okay...
in reply to a message by Perrine
It seems to be a spelling variant of Oisín so it should be aw-sheen (see Oisín). But it sure doesn't look like it! I would avoid this spelling, I think Ossian will become OSS-see-ehn or OSH-ehn but never aw-sheen whereas with Oisín people are more likely to just ask how it is pronounced.
Please rate my list: https://www.behindthename.com/pnl/6232
Please rate my list: https://www.behindthename.com/pnl/6232