masc. proper name, Middle English Rycharde, from Old French Richard, from Old High German Ricohard "strong in rule," from Proto-Germanic *rik- "ruler" (see rich) + *harthu "hard," from PIE *kar-o- (from PIE root *kar- "hard"). "One of the most popular names introduced by the Normans. Usually Latinized as Ricardus, the common form was Ricard, whence the pet form Rick, etc." ["Dictionary of English Surnames"]

"stupid, contemptible person," by 1969, from dick in the "penis" sense + head (n.).

also dickie, dickey, a diminutive form of dick, used in a variety of senses whose origin, application, and connection are more or less obscure. These include: "detached shirt front worn in place of a shirt" (1811); "a leather apron" (1874); "a donkey" (1793); "a small bird," (1851, short for dicky-bird, a nursery-word attested from 1781); "seat in a carriage on which the driver sits" (1801). For at least the garment senses Century Dictionary suggests Dutch dek "a cover, a horse-cloth."

"stupid person," 1967, originally U.S. student slang, perhaps from earlier meaning "penis" (1964), itself probably an alteration of dick (n.). Related: Dorky; dorkiness.