There seems to be evidence, albeit in some cases circumstantial, that the various branches of the Wincoll and Winchell families trace back to the neighbourhood of Little Waldingfield in the English county of Suffolk.
My mother is a Wyncoll and her grandfather, Charles Edward Wyncoll, researched the family's origins a century or so ago. His findings were published privately in "The Wyncolls of Suffolk and Essex" (1912) of which I know there is a copy in the British Library, as well as a few in family hands.
The variant spellings of the surname are discussed in the book and a common ancestry is attributed to a John Wyncoll, clothier, of Little Waldingfield, whose will survives from 1521. "Clothier" is a term applied to a caste of Flemish manufacturers of particularly fine cloth who became established in Suffolk and Essex at the invitation of Edward III. Some sample accounts attesting to the wealth generated from that trade are published in the recent history of "The Isles" by Norman Davies (MacMillan 1999).
Earlier instances of the name exist, although proof of direct lineage is more difficult. The first mention is in the "Calendar of Patent Rolls" for the reign of Edward III where one Ricus de Wynkle is described as Confessor Regis. It is suggested that this royal confessor may have accompanied Edward's spouse, Queen Philippa of Hainault, from her Flemish home to the English court in around 1328.
The Encyclopaedia Britannica entry for Philippa of Hainault mentions that her Chaplain was instrumental in the foundation of Queen's College at Oxford University. Is anyone able to confirm whether this might be the same Ricus de Wynkle?