shillelagh (n.)youdaoicibaDictYouDict[shillelagh 词源字典]
"cudgel," 1772, earlier, "oak wood used to make cudgels" (1670s), from Shillelagh, town and barony, famous for its oaks, in County Wicklow, Ireland. The name is literally "seeds (or descendants) of Elach, from Irish siol "seed."[shillelagh etymology, shillelagh origin, 英语词源]