John,
I assume you know Ann Boyd's ancestry and she is not the Quine.
You could try a longshot. You should be able to get Jane's birth certificate which may contain the family address in Stepney. You could use this to look for the family in the 1861 census. If you strike it lucky it would give his place of birth i.e which part of London.
Is it possible that William married Mary in England? If so a wedding certificate may exist which would give his fathers name.
Looking at the FreeBMD website there are Kewleys in Stepney who could be related to your family.
Good luck with your search.