palmer (n.)youdaoicibaDictYouDict[palmer 词源字典]
"pilgrim who has returned from the Holy Land," late 12c. (as a surname), from Anglo-French palmer (Old French palmier), from Medieval Latin palmarius, from Latin palma "palm tree" (see palm (n.2)). So called because they wore palm branches in commemoration of the journey.[palmer etymology, palmer origin, 英语词源]