nobody (n.)youdaoicibaDictYouDict[nobody 词源字典]
mid-14c., no body "no person noone," from Middle English no (adj.) "not any" + bodi (see body (n.)). Written as two words 14c.-18c.; hyphenated 17c.-18c. Incorrect use with their is attested from 1540s. Meaning "person of no importance" is from 1580s.[nobody etymology, nobody origin, 英语词源]