Matthew Poole and continuators on 2 Timothy 1:18

18 The Lord grant unto him that he may find mercy of the Lord in that day : And in how many things he ministred unto me at Ephesus, thou knowest very well.

This would incline us to think that Onesiphorus was yet alive; the term mercy he here prays that he may find of the Lord is comprehensive of all good, both Corporal, and Spiritual, which he prays God the Father to grant to this good man, to find from the Lord Jesus Christ in that day, when he shall come to judge the Quick and the Dead; for he had not only ministred to the Apostle while he was a Prisoner at Rome, but many wayes at Ephesus (where probably this Onesiphorus lived) which Timothy being there well knew.