I came across a Boag who married into my Smith family tree and it maybe useful to you.
She is:
Jessie Christina Cooke Boag born Mar 24, 1888 in Crieff, Perthshire Scotland.
Her parents are:
Hugh Boag and Ann McGregor who were married July 7, 1874 in Muthill, Perthshire.
Jessie married Peter Smith Dec. 17, 1909 in Crieff.
Her father Hugh was deceased but her mother attended the wedding.
I hope the above is helpful to someone out there.