Scandinavian surnames based upon personal designations are more numerous in England, but these come nearly all, if not all, from ancient Northumbria, which included Yorkshire.  There the descendants of the old Danish and Norse settlers clung to their ancient nomenclature later than elsewhere—indeed, till the fashion of adopting surnames prevailed.  We have such names.  Bard has become Barth, unless it be a contraction, as is probable, of Bartholomew; Jökull yields Jekyll, Halfdan is now Haldane, Sweyn is Swayne, Olafr yields Oliver—but this comes to us through Normandy... (Family Names and Their Story, Baring-Gould, 1910).