John Arkhaph (also spelled Arkaph or Archaph) was the bishop of Memphis in Egypt in the 320s and 330s.
Possibly it is formed from arch (supreme) and apa (father) as an alternate to the title archiereus (high priest), which was used of the bishop of Alexandria in some Coptic documents.
[1] John is first mentioned in the Breviarium Melitii, a list of bishops and other clergy of the Church of the Martyrs submitted by Melitios to the Council of Nicaea in 325.
[1] The schism in the Egyptian church that had been healed at Nicaea was resumed in 328 at the election of Athanasius as bishop of Alexandria.
[4] There is a note added beside John's name in Athanasius' copy of the Breviarium: "was ordered by the emperor to be with the bishop".