He must the younger brother of Johann Georg Kirsch who was born in 1718 in Zuzenhausen. Nothing is known before that time. I am in possession of an ancestry book about my grandmother who was born a Kirsch. The book was compiled by her father in law who was working in the record department of the local city hall in Stuttgart, Germany. The book was compiled as part of proving Arian ancestry during the 3rd Reich. Pretty creepy stuff, but an interesting book. Obviously, our respective history goe their separate ways in the mid-eighteens century but I can supply some more info if you want. I even have a photograph of Johann Kirsch who was the grandson of Johann Georg. Really early days of photography