I am guessing that it's named after Ady the poet - in some places it's spelled "Ady's" and he is the only famous Ady I can find, and he lived at about the right time. However, he doesn't seem to have any connection with Peckham, so as I said it is just a guess. Anyway, I like the idea of living on a road named after someone who really knew how to live! A shining light of 19th C Hungarian literature DM, that's not like you - a true lady of the demesne doesn't scorn even her humblest smallholders.