O.E. feorr "to a great distance, long ago," from P.Gmc. *ferro (cf. O.N. fjarre, Du. ver, Ger. fern), from PIE *per- "through, across, beyond" (cf. Skt. parah "farther, remote, ulterior," Hitt. para "outside of," Gk. pera "across, beyond," L. per "through," O.Ir. ire "farther"). Far East "China, Japan, and surrounding regions" is from 1852.
go a long way. Be sufficient for nearly all that is required; also, last for a long time. For example, This turkey will go far to feed the people at the shelter, or She can really make that small amount of cash go a long way.
[ Early 1400s