masc. proper name, popular in England and Scotland by mid-12c. (Pope Gregory I sent the men who converted the English to Christianity), nativization of Late Latin Gregorius, literally "wakeful" (equivalent to Latin Vigilantius), from Greek gregorios, a derivative of gregoros "to be watchful," from PIE root *ger- (2) "to be awake" (source also of Sanskrit jagarti "he is awake," Avestan agarayeiti "wakes up, rouses"). At times confused with Latin gregarius (see gregarious).