blackbird (n.)youdaoicibaDictYouDict[blackbird 词源字典]
late 15c. (late 13c. as a surname), from black (adj.) + bird (n.1). OED says so called for being the only "black" (really dark brown) bird among the songbirds, reflecting an older sense of bird that did not include rooks, crows, ravens.[blackbird etymology, blackbird origin, 英语词源]