In view is Robert C. Newman’s article “The Ancient Exegesis of Genesis 6:2, 4,” Grace Theological Journal, 5, 1 (1984 AD), pp. 13-36.
Newman notes that the “interpretation of ‘sons of God’ as angels and ‘Nephilim’ as giants dominates” the ancient interpretations and is thus the older view of both Jewish and Christian commentators. He surveyed “the ancient interpretation of Gen 6:2, 4 in Jewish literature, in Christian literature and in the NT in particular: