Kilby, in the Guthlaxton Hundred of Leicestershire, was probably an Old English compound from Old English cild (cilda genitive plural) ‘a child, a young person, a boy, a son (usually implying noble birth)’ and Old English tun ‘an enclosure; a farmstead; a village; an estate’. The place-name underwent Scandinavianization with the generic tun being replaced with Old Norse by ‘a farmstead, a village’ and the use of an initial Old Norse k for the Old English initial ch.
