PeteyoudaoicibaDictYouDict[Pete 词源字典]
familiar form of masc. proper name Peter. For Pete's sake is attested from 1903 in a list of children's expressions published in Massachusetts, probably a euphemistic use of the disciple's name in place of Christ; as an exclamation or quasi-oath, Peter! was in use 14c., but this likely is not connected to the modern use.[Pete etymology, Pete origin, 英语词源]