How could Luke be a Jew if he had a Roman name?
Luke could be a Jew despite his Roman name because many Jews of that time had both Jewish and Roman names, as Saul had the Jewish name and Paul the Roman name. The claim that Luke was not a Jew is weak; he was probably one of those Jews who carried a Roman name.
Les explains that the only hope for claiming Luke was not a Jew is as thin and weak as cotton thread. He says it is far more likely that Luke was a Jew, even though he had a Roman name, just as Saul had a Jewish name while Paul was his Roman name. Many Jews of that time had both Jewish and Roman names, so Luke was probably one of them. Les also expresses appreciation for the confirmation that Luke is part of the Jewish writers of Scripture, then calls this point an aside before moving on to 2 Corinthians 11:5.
More Questions
If Luke was a Jew, why does he have a Roman name?
Les teaches that Luke having a Roman name does not make him a Gentile, since Paul also had a Roman name—Saul was his Jewish name and Paul his Roman name—and something similar likely happened with Luke.