"by necessity, by compulsion," early 14c., a northern and Scottish word, marked as obsolete in OED; from need (n.) + way (n.), with adverbial genitive. In a similar sense Middle English also had needgates, needlong (c. 1400).
needle
needlepoint
needless
needlework
needs
needways
needy
neep
neese
nefandous
nefarious