I have researched back to my 5 x Gt Grandfather John Jeffes (I have a copy of his Will). However I am not sure of the year of his birth. He had a brother Thomas. John's daughter my 4 x Gt Grandmother was Dille Marata Jeffes born in 1765 in Bardwell Suffolk. I have not been able to get beyond John.
Most of the information about the Jeffes on Ancestry.co.uk is regarding the Cheshire Jeffes.