I’ve checked with catholic.org and I can’t find an entry for “St Oharra” in the listing of official saints.
(Maybe he’s one of those New Orleans Saints I’ve been hearing about.)
St Oharra is apparently the patron of middle-aged men who like other middle aged men and who are attacked by exploding escargot. I imagine him pierced through with snail shell shards, something like the martyrdom of St. Sebastian with the arrows.