Etymology
Various etymologies:
* A variant of the English surname Ayer.
* A topographic surname for someone who lived by an enclosure, from Middle English hay (“enclosure, hedge”) + -er.
* Borrowed from French Hayer, an occupational surname for a warder of a woodland, from Old French haye (“hedge”).
* Borrowed from South German Hayer, from an agent derivative of Middle High German heien (“to guard, protect”).
* Borrowed from Punjabi ਹਾਈਯਰ (hāīyar), surname based on the name of a Jat clan.