Roger Bagnall evaluated name occurrences in documentary texts to tentatively estimate the rate of Christianization of Egypt. His results challenged the notion that Egyptian Christianization was a gradual process (per Roger Rémondon, 1952).
Roger S. Bagnall, 'Religious Conversion and Onomastic Change' BASP 19 (1982): 105–124.
Bagnall's data have come under fire for various reasons, but are still very much defensible. Two matters bear consideration with regard to the low 3rd century numbers. First, Earlier Christianity was probably centered in the metropolitan areas. Second, Christian names may have been avoided during and after the persecutions affecting the data.
Ewa Wipszycka, 'La valeur de l'onomastique pour l'histoire de la christianisation de l'Egypte' ZPE 62 (1986): 173–181.
Roger Bagnall, ‘Conversion and Onomastics: a Reply’ ZPE 69 (1987): 243–250 (reprinted in Later Roman Egypt, 2003).
Ewa Wipszycka, 'La christianisation de l'Egypte aux IVe–VIe siecles: Aspects sociaux et ethniques' Aegyptus 68 (1988): 117–165.
Research Group: Mark Depauw (Coordinator), "Names and Identities in Christian Egypt" (Katholieke Universiteit Leuven) funded for 2009–2012.