I only found two references to CORBOY (with that spelling) vis:

Highland Co. Personal Tax Records
CORBOY Cornelius 1860 Clay Twp.

and

Highland Co. Cemetery Records
Catholic Cemetery, Village of Hillsboro, Liberty Twp.
CORBOY Mary, wife of Cornelius. d. Aug. 9, 1897 Age 57-9-24.
John. b. in Co. Tipperary, Ireland. d. Dec. 15, 18883. Age 61 yrs.
Margaret. b. in Co. Tipperary, Ireland. Nov. 1, 1835. d. June 15,
1900. Age 65 yrs.
Daniel Martin, son. b. Nov. 1, 1878. d. June 20, 1884. (same
stone)

I also so a few references to a Corby family - mostly referencing Francis Corby who married Sarah E. Patterson and had a daughter, Hattie, who married Frank Rhodes Glascock.