Family name origins & meanings
- English (Essex) and German (also Häsler) : topographic name from Middle English hasel, Middle High German hasel + the English and German agent suffix -er.
- English : habitational name from Haselour in Staffordshire or Haselor in Warwickshire and Worcestershire, named with Old English hæsel ‘hazel’ + ofer ‘hill’, ‘ridge’.
- Variant of German Hassler.