I haven't gone back as far as you have with my Ohio Kemps, but I have the following:

Isaac B. KEMP (born abt 1835 in Nevada, Wyandot Co, OH). He married a Nancy (unknown). Isaac served in the Civil War (Company "A", 123rd Regiment or the Ohio volunteer infantry). Isaac was a member of the United Brethren Church and the Grand Army of the Republic (G.A.R.) in Wyandot County. They had at least one child:

Joseph L. KEMP (born 1873 in Sycamore, Wyandot Co, OH). He married Melissa COMER (10/23/1874 - 2/15/1974). Joseph died in 1903 in LaFox, IL in a flour mill accident.

I would be very interested if these gentlemen are related to your Kemps.