Inherited from Old English nēahġebūr, from Proto-West Germanic *nāhwagabūrō, from Proto-Germanic *nēhwagabūrô. Corresponds to neygh + bour.
In late Old English, nēahġebūr is regularly shortened to nĕhġebur (/ˈnex.je.bur/); this creates a pronunciation difference between nēah and nēahġebūr); this regularly develops into /ˈnɛi̯x(ə)bur/. forms with /iː/ are due to the influence of (some forms of) neygh, while forms with final-syllable /uː/ are due to the influence of bour (and possibly -our).
The last two forms discussed here are both attributable to a loss of /x/; forms with /nɛː/ is from an OE contracted form *nēahbur, *nēabur, where /x/ was lost before it could cause the diphthongisation ("breaking") of the preceding vowel and shortening was prevented due to the loss of a syllable, while forms with /p/ are apparently due to the mutual assimilation of /xb/.
neyghebour (plural neyghebours)