Modern coinage, a blend of Rhoda and Rhona. It is now often taken to be a Welsh name derived from rhon ‘pike, lance’ (as in Rhonwen;) + -da ‘good’, as in Glenda. The name is associated particularly with the American film actress Rhonda Fleming (b. 1923 as Marilyn Louis).
German: from a short form of the personal name Jodocus, which is either a Latinized form of a Breton name, Iodoc, borne by a 7th-century Breton saint (compare Jost and Joyce) or from a reduced form of the personal name Augustus.