minstrelyoudaoicibaDictYouDict[minstrel 词源字典]
minstrel: [13] Originally minstrel, like its close relative minister, denoted a ‘servant’. Its musical associations are a comparatively recent development. It goes back ultimately to late Latin ministeriālis ‘official’, a derivative of Latin ministerium (source of English ministry). Old French took it over as menestral, and it was here that a gradual specialization in meaning took place, from ‘servant’ via ‘entertainer’ to ‘singer’.
=> minister[minstrel etymology, minstrel origin, 英语词源]
minstrel (n.)youdaoicibaDictYouDict
early 13c., from Old French menestrel "entertainer, poet, musician; servant, workman; good-for-nothing, rogue," from Medieval Latin ministralis "servant, jester, singer," from Late Latin ministerialem (nominative ministerialis) "imperial household officer, one having an official duty," from ministerialis (adj.) "ministerial," from Latin ministerium (see ministry). The connecting notion is via the jester, etc., as a court position.

Specific sense of "musician" developed in Old French, but in English until 16c. the word was used of anyone (singers, storytellers, jugglers, buffoons) whose profession was to entertain patrons. Only in 18c. was the word limited, in a historical sense, to "medieval singer of heroic or lyric poetry who accompanied himself on a stringed instrument." Reference to blackface music acts in U.S. is from 1843.