A.T. Robertson Commentary Romans 16:15

"Salute Philologus and Julia, Nereus and his sister, and Olympas, and all the saints that are with them." — Romans 16:15 (ASV)

Philologus (Φιλολογον). Another common slave name.

Julia (Ιουλιαν). The commonest name for female slaves in the imperial household because of Julius Caesar. Possibly these two were husband and wife.

Nereus (Νηρεα). Found in inscriptions of the imperial household. But the sister's name is not given. One wonders why.

Olympas (Ολυμπαν). Possibly an abbreviation for Olympiodorus.

All the saints that are with them (τους συν αυτοις παντας αγιους). Possibly another church in the house. These unnamed, the "and others," constitute the great majority in all our churches.