parvenu (n.) Look up parvenu at Dictionary.com
"upstart," 1802, from French parvenu, "said of an obscure person who has made a great fortune" (Littré); noun use of past participle of parvenir "to arrive" (12c.), from Latin pervenire "to come up, arrive, attain," from per- "through" (from PIE root *per- (1) "forward," hence "through") + venire "to come," from a suffixed form of PIE root *gwa- "to go, come." As an adjective from 1828.