Steve, my impression of the frequency of the breeches and the bridge stanza match yours. That of the others sounds right too.

BTW, the surname O'Linn may have nothing to do with a geographical place.

The genealogy sites call it an anglicization of Irish "O Floinn," i.e. "Flynn" and "O'Flynn."

Texts with "Barney O'Flynn," etc., exist, prob. as a rationalization of he less familiar "O'Linn."