The story
- Proto-Indo-European · derived from*speh₁-“to succeed”
- Proto-Italic · derived from*prosparos
- Latin · derived fromprosperō“to render happy”
- Old French · derived fromprosperer
- English todayprosper
From Old French prosperer, from Latin prosperō (“to render happy”), from prosperus (“prosperous”), from Proto-Italic *prosparos, from Proto-Indo-European *speh₁- (“to succeed”), whence also Latin spēs (“hope, expectation”).
Words from the same roots
Old Frenchprosperer all →
Latinprosperō all →
Proto-Indo-European*speh₁- all →
speed
Etymology from Wiktionary, CC BY-SA 4.0.