"That Siobhan is a real looker, and she can sing, too. Y'all vote for her. Anybody who looks that pretty, sings that well, and is named Siobhan should get our support."

You're a man of great wisdom and taste.

Pronunciation wise, I think most folk in Scotland would go for something approaching Shi-vawn (or indeed Sh'vawn)..but as you say it's an Irish name, so that's maybe no guide.

Oh, and Lachlan said "I think the Scottish Gaelic version of Joan is Seonag (Shawnak)". Lol - I'd always thought the Scottish name was Seonaid, and that was the Gaelic for Janet. Just goes to show every day's a schoolday.