I know some might poke fun on me, but the fact is, my father and I never know who was my grand father. My father was born in 1946, in a village named Presles situated 30 kilometers from paris. My grand mother just died. Just before, she gave us a name "John Davis" an american soldier. Now I know why I was good at languages at school . That's all we know.
I assume this is quite a common nanme & to be franck, I don't know where to star my research.