It is the term that drived from the old Kurdi word(still used as is today).It has similar manning in Sunskrit/Persian or Avestan but as a whole and direct determination it is a Kurdish word and it directly refers to the Aryan(White) race.
Ar(meaning in Kurdish: 1White.2Noble.3Pure.4Wholy.5Flour.6the color of flour.
Ar+i=the condition of being white,noble etc.+an=a white person as singular and as plural also the same with(+an)white people.Probably arrived into nearby regions of Kurdistan(Iran,Afganistan,India etc.) from Kurdistan during the one of the first Kurdish Empires.And then finally to Europe etc.
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