Romans 16:10 - Coke's Commentary on the Holy Bible

Them—of Aristobulus' household— There is no certain evidence that either Aristobulus, or Narcissus, Romans 16:11 were Christians. It seems most probable that they were persons of high rank, who had each a large family of slaves or domestics; some of whom being Christian converts, the Apostle would not forget them, low as their rank was in life, when he was saluting his brethren in so particular a manner. We may observe what a regard the Apostle had for foreign churches, when he informed himself of the names, circumstances, and abode of so many of them in Rome. See Doddridge.