A petition by Aurelius Isidorus (of archive fame) contains the earliest recorded reference to a monk (to be added to LSJ s.v. μοναχός II) in Egypt (6 June 324 AD).
Consider, especially, lines 7-12:
καὶ κ̣α̣τ̣α̣λαβο|μένου μου τὴν βοῦν καὶ ἀνάγοντος αὐτὴν | ἐπὶ τῆς κώμης ἀπαντήσαντές μοι κατὰ τοὺ̣ς̣ | ἀγροὺς μεγα ῥοπάλῳ καὶ χαμαιρ̣ι̣φ̣ῆ̣ ἐ̣μὲ ποι|ησάμενοι πληγαῖς κατέκοψαν καὶ τὴν βοῦν̣ ἀφείλαντο,
The monk had the (Biblical) name Isaac, while the deacon was named Antoninus.