Christian U. Gerber who was b. in OH 1839 and died there in 1919, was the son of Ulrich Gerber.
Christian Gerber born 1794, who died in 1874 in Switzerland was the son of Hans Gerber.
We may need more specific informaiton on when the Christian Gerber you are referencing was born and where he was born in order to research for the first name of his father. Birth, marriage and death dates would be useful if you have some or all of them or an approximation. City, county, and country information would help too.