Fenian (n.)youdaoicibaDictYouDict[Fenian 词源字典]
1816, a modern Irish blend of Old Irish feinne, plural of Fiann, name of a band of semi-legendary Irish warriors + Old Irish Fene, name of the ancient inhabitants of Ireland. In reference to Irish-American brotherhood of that name (founded 1857), attested by 1864.[Fenian etymology, Fenian origin, 英语词源]