You also might want to check out Isaac H. Fonda, who was a contemporary of Isaac I. Fonda and Isaac Deuwese Fonda.Both Isaac H Fonda and Isaac I. Fonda served in the 12th Regiment of the Albany County Militia.Isaac Deuwese Fonda served in the 13th Regiment of the Albany County Militia, as did most of the young men who lived in the Saratoga District.
Just for giggles I checked the index of Family Tree Maker's CD ROM #132.It lists the following adult male Fondas in New York State at the time of the Revolution.
Abraham - Schenectady Abraham D. - 3rd Regiment of ACM Adam - Caughnawaga District Tryon County Cornelius - 8th Regiment of ACM David - 1st Regiment of ACM Douw Douw I. Douw J. Dowe - West Claverack District Eldart - 14th Regiment ACM Isaac - 6th Regiment ACM Isaac - 12th Regiment ACM Jacob - Schenectady Dist.2nd Reg. AMC Isaac H. - 12 Reg ACM Isaac I. - 12th Reg ACM Jacob D Jacob G. Jacobus James Jan Janlite - West Claverack Jelles Jelles, Jr. Jelles A. Jelles J. Jelles P. Jellis Jellis A. Jeremiah Jilles A John John, Jr. John A. John D. John H. John J. John P. Laurence Lawrence Lourance Lowrence Peter and Peter A.