Fragment 8. Of Abraham
From this rises the appellation of the Hebrews.For the word Hebrews is interpreted to mean those who migrate across, viz., who crossed the Euphrates with Abraham; and it is not derived, as some think, from the fore-mentioned Heber. From the flood and Noe, therefore, to Abraham's entrance into the promised land, there are in all 1015 years; and from Adam, in 20 generations 3277 years.
Source: Extant Writings (New Advent)