The Oxford Names Companion, OUP "Scottish Forenames" - Donald Whyte, FGH, FSG Chambers Dictionary [2003]
Notes:
Jewish from Hebrew, reputedly meaning "lofty; mountaineer" although it is probable that it has an Egyptian origin, of unknown meaning; OT Exodus 28:1. Aharon is the modern form.
Thanks to Donald Whyte who provided much of the initial information for this site.