The "Wow o Riven" was a church bell in the area, and is mentioned in the ballad about Tam o Riven (Thomas Gordon), a knight who lived in The "Wow o Riven" became the title of one of George MacDonald's short stories too, which plays in Ruthven. The hero of the story is the old "fool", who became known as "colonel" and is buried near to the old bell.
References
^Johnston, James (1972) [1934]. Place-names of Scotland (3 ed.). Wakefield: S. R. Publishers. p. 285. ISBN0-8540-9634-5.