I have read somewhere that the Ric part of Richard derives ultimately from the Latin Rex (King) - from which probably derives the notion of Richard meaning ruler.
Andrew Proud Adopter Of Many Lovely Punctuation Pets; See My Profile For Their Names."Faith is taking the first step even when you don't see the whole staircase." MartinLutherKing, Jr."It is not length of life, but depth of life." RalphWaldoEmerson
The Ric- in Richard is not derived from Latin, but the root ('reg-' for 'rule') is cognate and appears in both the Latin and the Germanic branches of Indo-European. Compare the modern German word 'Reich' (kingdom, realm).