Given the proximity plus the mention of Spoon River I'm betting there is a connection here!
Are you able to share your Grandfather's name? Then I might be able to tie you in to one of the Fulton or Mason Co. Cluney lines. Email me privately if you wish.
Such a pity about that Bible! It probably could have cleared up many a mystery.
As far as the Cluny/Cluney spelling goes, it does seem like about three or so generations ago there was some of the family spelling it one way, some the other. If I'm remembering correctly, the folks in Mason Co. were keeping to the Cluny spelling a bit more ...