The Purkis and Quintrell/Quantrell/Quantrill are not connected the Qs are married ins and come from Norfolk.

Ellen Purkis born about 1800 always assumed it was London but who knows, married Francis Smith widower (never found his first marriage I think he was a bit older) on 4 September 1818 • St Matthew Church, Bethnal Green, England, had 3 daughters one my ancestor Harriet the other two Sarah and Charlotte I have no idea what happened to them or Francis and Ellen for that matter, where they came from or their deaths either. I think I have her on an 1841 census but not sure it is her.

There is a baptism in Westminster but I don't think it's her.

Edited Actually scrap that they are connected in a way William Q married Elizabeth Worley Harriet's Smith's daughter, Harriet was Ellen Purkis' daughter.