Hammond Name Meaning
English (of Norman origin): from a personal name, Hamo(n), which is generally from a continental Germanic name Haimo, a short form of various compound names beginning with haim ‘home’, although it could also be from the Old Norse personal name Hámundr, composed of the elements hár ‘high’ + mund ‘protection’.
As an Irish name it is generally an importation from England, but has also been used to represent Hamill and, more rarely, McCammon.
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Was it Hammond or Hammonds with an "S"? Who knows? It varied from generation to generation and from individual to individual. Probably confusion between singular and plural.