Prisca and Aquila - (Act 18:2, Act 18:3; Rom 16:3, Rom 16:4; 1Co 16:19, written from Ephesus, where therefore Aquila and Priscilla must then have been).
household of Onesiphorus - If he were dead at the time, the “household” would not have been called “the household of Onesiphorus.” He was probably absent (see on 2Ti 1:16).