We are researching the same family.My husband is descended from John Wickens who was Christopher's brother. They are the sons of William and Mary Wickens (nee Cuckney) of Cobham.William is the son of John Wickens and Martha (nee Bennett) of Fairseat.They were married in Meopham in 1799.I have been unable to trace the family any further back as I do not know where this John was born.
Mary Cuckney's father was Christopher Cuckney baillif at Cobham Hall so that is where your Christopher Wickens got his Christian name.
I have a lot more information to give you but all my research papers are packed away and I don't have time to dig them out today.Your message was posted a long time ago and so you may have researched all this for yourself by now. Do get in touch and we will take it from there.