(French) form of Christina. It was popular in the medieval period, when it appears to have been used interchangeably with Christian, and again in Britain at the end of the 19th century. In the United States it was particularly popular from the 1950s to the 1970s.
English: habitational name from places in Buckinghamshire, Northamptonshire, and Staffordshire called Hartwell, from Old English heorot ‘stag’, ‘hart’ + wella ‘spring’, ‘stream’. In some cases the surname may have arisen from Hartwell in Hartfield, Sussex or Hartwell in Lamerton, Devon.