köken: Inherited from Old French druide (13th c.), borrowed from Latin druidae, from Gaulish *druwits, from Proto-Celtic *druwits (“wise person”). The Old French form is definitely a borrowing and not inherited. The question poses itself, however, whether the word was inherited since then or borrowed again later on.
köken: Borrowed from French druide, assumed singular of attested plural Latin Druidae, from Gaulish [Term?] (compare Irish draoi (“druid, wizard”), Scottish Gaelic druidh (“charmer, sorcerer”)). More at English druid.
köken: PIE word *dóru From Old Irish druï, druí (“druid; magician, wizard, diviner”), from Proto-Celtic *druwits (literally either “tree-knower” or “firm knower”), the second element the same as in saoi (“sage”), daoi (“fool”), and Old Irish ainb (“ignorant”). Cognate with Scottish Gaelic draoidh, Welsh derwydd, Cornish drewydh, Manx druaight, druaightagh, druaightys, Welsh dryw.