How interesting, my william is an Oven not Ovens (I know its splitting hairs) I suspect he is the brother of John Oven who was born in St Martins, London. I have no reason to doubt that this lot are from London, but Wm is said not to be born in the county of Mdx, as is John. I have reason to believe the family came from Lambeth, unfortunately the parish registers for St Marys has not been transcribed onto Ancestry so I haven't found this either, nor have I found Johns. It is quite possible that they came from further afield and like others came to London. Are you researching Ovens?