E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A Venetian gentleman in Shakespeares Othello. He was in love with Desdemona, and when the lady eloped with Othello, hated the noble Moor. Iago took advantage of this temper for his own ends, told his dupe the Moor will change, therefore put money in thy purse. The burden of his advice was always the samePut money in thy purse.
This word is sometimes pronounced Rodr-igo: e.g. It is as sure as you are Roderigo; and sometimes Rode-rigo: e.g. On, good Roderigo; Ill deserve your pains. (Act i. scene 1.)