Randy
mid 17th century: perhaps from obsolete rand ‘rant, rave’, from obsolete Dutch randen ‘to rant’.
wiktionary
1690, from Scottish randy(“boisterous, aggressive”), of uncertain origin. Probably from rand(“to storm, rave”, verb), a variant of rant, see rant; or from rand(“edge”, noun), in the sense of "edgy, on edge", from Middle English rand(“edge, brink, margin, border”), from Old English rand(“edge, border, margin, rim”). Related to randan.
randy (plural randies)
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)
etymonline
randy (adj.)
1690s, "aggressive, boisterous," a Scottish word of uncertain origin, probably from rand "to rave," an obsolete variant of rant (v.). "In early use always of beggars, and probably implying vagrant habits as well as rude behavior. Now applied only to women" [OED]. The sense of "lewd, lustful, noisily wanton" is attested by 1847. Compare Scottish and northern English randy (n.) "a sturdy beggar or vagrant" (of males); "a noisy hoyden, a rude, romping girl." Related: Randiness.
