The Carpenter Collection index lists only 3 items for "Shenadoah", but over 30 (including duplications) for "Shanadore".

One collected from Alex Henderson of Tayport, Dundee bears the notation Mixture of Sally Brown, while another from Henderson is noted Alternative title "Shallow in the Morning". Mr Henderson is noted Shipped 1885; left sea 1902; was in American ships.

I'm not sure if this clears anything up, or adds to the confusion.