Which - That is, Timothy. The connection requires us to understand this of him. Of the character of his father nothing is known.
Was well reported of - Was esteemed highly as a young man of piety and promise. Compare the notes on Acts 6:3. Compare 1-Timothy 5:10. Timothy had been religiously educated. He was carefully trained in the knowledge of the holy Scriptures, and was therefore the better qualified for his work, 2-Timothy 3:15.

Which was well reported of - These words are spoken of Timothy, and not of his father. At this time Timothy must have been very young; for, several years after, when appointed to superintend the Church at Crete, he appears to have been then so young that there was a danger of its operating to the prejudice of his ministry: 1-Timothy 4:12, Let no man despise thy youth. He had a very early religious education from his godly mother Eunice, and his not less pious grandmother Lois; and, from his religious instructions, was well prepared for the work to which God now called him.

Which was (b) well reported of by the brethren that were at Lystra and Iconium.
(b) Both for his godliness and honesty.

Which was well reported of,.... Not the father of Timothy, but Timothy himself; to whose piety, virtue, and good conversation witness was borne,
by the brethren that were at Lystra and Iconium; the members of the churches which were in these places, and which were not far from one another; and as it is necessary that ministers of the Gospel should have a good report of them that are without, so likewise of them that are within; and the testimony of the latter is preferable to that of the former.