α. Old English britnian, Old English brynodan (plural past indicative, transmission error), Old English brytnian, Middle English breten, Middle English bretin, Middle English bretn- (inflected form), Middle English bretten, Middle English bretton, Middle English brettyn, Middle English bretyn, Middle English briten, Middle English britn- (inflected form), Middle English brittene, Middle English brittn- (inflected form), Middle English britton (in a late copy), Middle English brittun, Middle English brittyn, Middle English brityn, Middle English bruten, Middle English brutn- (inflected form), Middle English bruttene, Middle English bryton (in a late copy), Middle English brytten, Middle English bryttyn, Middle English brytyn, Middle English (1600s– English regional (northern)) britten, 1800s– britt'n (English regional (northern)); Scottish pre-1700 bretyn, pre-1700 brittyn, pre-1700 britynnit (past tense), pre-1700 brytn- (inflected form), pre-1700 bryttin.
β. late Middle English birten, late Middle English byrten, late Middle English byrttyn; Scottish pre-1700 barnit (past tense, transmission error), pre-1700 bartyn, pre-1700 bertn- (inflected form), pre-1700 bertyn.