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First name origin & meaning:

Old English: Heath

First name variations: Haddan, Haddyn, Hadden

Last name origin & meaning:

English: habitational name from any of the various places, in Derbyshire, Northamptonshire, and Devon, named with Old English hǣð ‘heathland’, ‘heather’ + dūn ‘hill’, or from Haddon in Cambridgeshire, which is probably named from the Old English personal name Headda + dūn.