Ancestry.com. Genealogy of the surname Yarker [database on-line]. Provo, UT: Ancestry.com Operations Inc, 2005.Original data: Yarker, John,. Genealogy of the surname Yarker : with the Leyburn and several allied families resident in the counties of Yorkshire, Durham, Westmoreland, and Lancashire : including all of the name in Cumberland, Canada, America, and Middlesex (from the Conquest to the present time). Manchester: A.M. Petty & Co., printers, 1882.