An Etymological Dictionary of the German Language/Nachbar
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Nachbar, m., ‘neighbour,’ from the equiv. MidHG. nâchgebûr, OHG. nâhgibûr, nâhgibûro, m.; corresponding to Du. nabuur, AS. nêhhebûr, m., E. neighbour; a common West Teut. compound, pointing to Goth. *nêhwagabûr, m.; it signifies ‘he who lives near to another.’ Comp. Bauer.