Y-DNA project for Kingdon and similar surnames. Please join this project if your surname is Kingdon or one of its possible variations including Kyngdon, Kingdom and Kingsdon, or if your earliest known ancestor in the male line had one of these surnames. The surname Kingdon is believed to have originated in the South West of England, with multiple possible points of origin in Cornwall, Devon and Somerset. The name is understood to be toponymic, deriving from "King's Dun" (King's Hill) as opposed to King's Town as in Kingston.