This interesting surname is of early medieval Welsh origin, and derives from the English personal name Roger, itself from the Old Germanic "Hrothgar", composed of the elements "hroth", fame, with "gar", spear. In England the name was introduced by the Normans in the form "Rog(i)er". The Welsh sound system originally did not include the sound of "j", or the "g" of Roger; when words containing this sound were borrowed the nearest sound in Welsh was "s" or "si", so that Roger became Roser, usually written Rosser; with the initial "r" giving the aspirate quality. The surname is first recorded in the latter half of the 13th Century