John was born to John Cocker and he was baptised on te 28th September 1719 at St Peter's Church in Yaxham.
https://www.freereg.org.uk/search_records/5818a1f7e93790eca3835c11/john-cocker-baptism-norfolk-yaxham-1719-09-28?locale=en
C > Cocker > John Cocker