The story
- Proto-Indo-European*h₁éǵʰ
- Proto-Indo-European*h₁éǵʰs
- Proto-Italic*eks
- Latinex
- Latinex-
- Middle Frenchex-
- Middle Englishex-
- Englishex-der.?
- Englishfranchiseder.?
- English todayeffranchise
Origin uncertain; possibly from ef- (a variant of ex- (prefix meaning ‘out of’)) + franchise (“to invest (someone) with a franchise or privilege”), possibly modelled after effranchiss-, a stem of Old French esfranchir, from es- (prefix denoting movement away from or separation) + franchir (“to set free”) (see further at enfranchise).
Etymology from Wiktionary, CC BY-SA 4.0.