Adam Clarke on Acts 16:1

A certain disciple - Bishop Pearce would read the latter part of this verse and the beginning of the next thus - A certain disciple named Timotheus, (the son of a certain Jewish woman that believed, but of a father who was a Greek), who was well reported of by the brethren, etc.

This Timothy was the same person to whom St. Paul wrote those two noble epistles which are still extant. His mother's name was Eunice, as we learn from 2Tim 1:5. What his father's name was we know not; he was either a mere heathen, or, at most, only a proselyte of the gate, who never submitted to circumcision: had he submitted to this rite, he would, no doubt, have circumcised his son; but the son being without it is a proof that the father was so too. Some MSS. state that Timothy's mother was now a widow; but this does not appear to be well founded.