... (A man named Hermogenes the coppersmith is mentioned in the Acts of Paul and Thecla, 3:1, where he is a companion of Paul but a hypocrite and flatterer. Onesiphorus is also mentioned in the next paragraph.) ...

... Paul is presented in these verses as being held in a prison in Rome, where he was visited by the faithful Onesiphorus. The example of Paul's faithfulness and that of Onesiphorus (cf. also 4:10) is contrasted with the behaviour of those in Asia who have turned against Paul, including two individuals, Phygelus and Hermogenes. Nothing else is known about these two men, but the verb used for 'turn away' is found also in 4:4 and Titus 1:14 where it has a sense implying the rejection of true teaching, rather than personal rejection. The latter is referred to as a coppersmith in the beginning paragraph of the second-century Acts of Paul and Thecla. He and Demas, it says, "were full of hypocrisy and flattered Paul as if they loved him" (Hennecke, New Testament Apocrypha 2:353; see Explanation), but the account is apocryphal. ...

... Demas, whose name is found together with Luke's and Mark's in Colossians 4:14 and Philemon 24 has actually deserted him (Demas is also named in Acts of Paul and Thecla, as is Hermogenes, as Paul's travelling companions). Alexander the coppersmith did Paul a great deal of harm; but who this Alexander was is uncertain. The author may have taken these names from Pauline traditions. ...