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English (mainly West Midlands): habitational name from either of three places called Hadley in Worcestershire and Shropshire or from either of two places called Hadleigh in Essex and Suffolk or Monken Hadley in Middlesex. The first is named from the Old English personal name Hadda + lēah ‘wood (woodland) clearing’; the others are from Old English hǣth ‘heathland heather’ + lēah. In some cases also Native American (Navajo): variant of Hatathlie ‘singer (i.e. medicine man)’. Compare Singer 5.
Source: Dictionary of American Family Names 2nd edition, 2022