Neighbour

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Old English nēahgebūr, from nēah ‘nigh, near’ + gebūr ‘inhabitant, peasant, farmer’ (compare with boor).

wiktionary

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From Middle English neighebor, neighbour, neihebur, from Old English nēahġebūr(“neighbour”), from Proto-Germanic *nēhwagabūrô(“neighbour”), equivalent to nigh +‎ bower. Cognate with Scots nichbour(“neighbour”), Saterland Frisian Noaber(“neighbour”), Dutch nabuur(“neighbour”), German Low German Navur(“neighbour”), German Nachbar(“neighbour”), Danish nabo(“neighbour”), Norwegian nabo(“neighbour”), Icelandic nábúi(“neighbour”). More at nigh, bower.

etymonline

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neighbour

chiefly British English spelling of neighbor (q.v.); for spelling, see -or.