Samhain (n.)youdaoicibaDictYouDict[Samhain 词源字典]
1888, from Irish samhain (Gaelic samhuinn), from Old Irish samain, literally "summer's end," from Old Irish sam "summer" (see summer (n.1)) + fuin "end." Nov. 1, the Celtic festival of the start of winter and of the new year.[Samhain etymology, Samhain origin, 英语词源]