Adam Clarke on Romans 16:22

I Tertius, who wrote this epistle - Some eminent commentators suppose Tertius to be the same with Silas - the companion of St. Paul. If this were so, it is strange that the name which is generally given him elsewhere in Scripture should not be used in this place. I have already noticed (Preface) that some learned men have supposed that St. Paul wrote this epistle in Syriac, and that Tertius translated it into Greek; but this can never agree with the declaration here: I Tertius, who wrote, γραψας την επιστολην, this epistle; not translated or interpreted it. It appears that St. Paul dictated it to him, and he wrote it down from the apostle's mouth; and here introduces himself as joining with St. Paul in affectionate wishes for their welfare.

Salute you in the Lord - I wish you well in the name of the Lord: or, I feel for you that affectionate respect which the grace of the Lord Jesus inspires. It is not clear whether the two following verses be the words of Tertius or St. Paul.