The hamlet name is Anglo Saxon in origin, and means 'Ceacca's moor'. It has been suggested though that the first part of the name could stem from the ancient word ceacce, meaning 'hill'. The hamlet was first recorded in manorial rolls in 1241 as Chakemore.
It is suggested by some that Chackmore was once a village in its own right, as anciently it had its own chapel, though this has long since disappeared.
Radclive, Radcliffe, or Ratliff is said to derive its name from the colour of the soil, and an abrupt eminece near the course of the Ouse, by which the parish is intersected.
The parish, which is called in ecclesiastical records Radcliffe cum Chackmore has been inclosed by an act of parliament passed in 1773, when an allotment was assigned to the rector in lieu of tithes, and a small allotment to the poor in lieu of their right to cut furze.
Chackmore - The name derives from the old english Ceacca + mor and means 'marshy ground of a man called Ceacca'.