The Collaborative International Dictionary of English v.0.48:

Neif \Neif\, Neife \Neife\ (n[=e]f), n. [OF. ne["i]f, na["i]f, a
   born serf, fr. L. nativus born, imparted by birth. See
   Native.]
   A woman born in the state of villeinage; a female serf.
   --Blackstone.
   [1913 Webster] Neif

The Collaborative International Dictionary of English v.0.48:

Neif \Neif\, Neaf \Neaf\ (n[=e]f), n. [Icel. hnefi; akin to Dan.
   naeve, Sw. n[aum]fve.]
   The fist. [Obs.] "I kiss thy neif." "Give me your neaf."
   --Shak.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

NEIF, old Eng. law. A woman who was born a villain, or a bond woman.