summoner (n.)youdaoicibaDictYouDict[summoner 词源字典]
"petty officer who cites persons to appear in court," secular or ecclesiastical, early 14c. (mid-13c. as a surname), from Anglo-French sumenour, Old French somoneor, from Medieval Latin summonitorem, from past participle stem of summonere (see summon). Contracted form sumner is from mid-14c.[summoner etymology, summoner origin, 英语词源]