Adam Clarke on Romans 16:11

Herodion, my kinsman - Probably another converted Jew. See on Rom 16:7 (note).

Of the household of Narcissus - Probably dead also, as we have supposed Aristobulus to have been at this time.

Which are in the Lord - This might intimate that some of this family were not Christians; those only of that family that were converted to the Lord being saluted. There was a person of the name of Narcissus, who was a freed man of the Emperor Claudius, mentioned by Suetonius in his life of that prince, cap. 37; and by Tacitus, An., lib. xii. cap. 57: but there does not seem any reason to suppose that this was the person designed by St. Paul.