Hans von Campenhausen states that "A son is named after his father as a matter of course."
Hans von Campenhausen, The Virgin Birth in the Theology of the Ancient Church (trans. Frank Clarke; Eugene, Oreg.: Wipf and Stock, 2011), 12n6
Nor do ‘the strict laws of the Jewish system of name-giving’', to which E. Stauffer refers in Jesus and his Story (ET, 1960), 24f., 166, affect the matter at all. A son is named after his father as a matter of course, and only in case of illegitimacy after his unmarried mother; but the remarks of the Nazareth crowd are not a record of births.