rob — de Vaan
rob 'servant, slave' [m.] < *orbo-y OIc. arfr 'heir' < *arbaz, Olc. αφ, OSwe. arve 'heir' < *arban-y Go. arbi, ORG arbi, OS erbi [n.] 'inheritance5 < *arbija-, Go. arbija, OHG arpeo, OE irfa 'heir' < *arbijan- 'having the inheritance'. According to Weiss, the root *h3rbh- 'to turn' here had the specific meaning 'to change membership from one social class to another'. Armenian and Greek can have *h3rbh-, *h3orbh- or … — [de Vaan, s.v. rob, p. 447]