16:11 Of the [household] of Narcissus. At the time Paul wrote, a favorite of Nero, named Narcissus, was all powerful in Rome. He probably meant a number of his servants having accepted Christ.
16:11 Those of the family of Aristobulus and Narcissus, who are in the Lord - It seems only part of their families were converted. Probably, some of them were not known to St. Paul by face, but only by character. Faith does not create moroseness, but courtesy, which even the gravity of an apostle did not hinder.
16:1-16 Paul recommends Phebe to the Christians at Rome. It becomes Christians to help one another in their affairs, especially strangers; we know not what help we may need ourselves. Paul asks help for one that had been helpful to many; he that watereth shall be watered also himself. Though the care of all the churches came upon him daily, yet he could remember many persons, and send salutations to each, with particular characters of them, and express concern for them. Lest any should feel themselves hurt, as if Paul had forgotten them, he sends his remembrances to the rest, as brethren and saints, though not named. He adds, in the close, a general salutation to them all, in the name of the churches of Christ.