Note 7 at Rom. 16:23: The name Gaius was a common Roman name. This name is used five times in scripture (Acts 19:29; 20:4; here; 1 Cor. 1:14; 3 Jn. 1) and refers to at least three different men.

Acts 19:29 refers to Gaius as being a man of Macedonia (see note 1 at Acts 16:9, p. 667) while Acts 20:4 refers to a Gaius who was of Derbe (see note 5 at Acts 14:6, p. 656), a city of Asia (see note 3 at Acts 16:6, p. 666).

It is probable that the Gaius referred to here is the same man that Paul mentioned in 1 Corinthians 1:14 since the book of Romans was written from Corinth (see Date and Place of Writing, p. 738). This would make Gaius one of the few people in Corinth that Paul actually baptized. This verse says that Gaius was not only Paul's host but of the whole church, implying that he had a house church meeting in his residence.

The apostle John addressed the epistle of third John to Gaius. Some speculate that this is the same Gaius that Paul is referring to here.

Note 8 at Rom. 16:23: The name "Erastus" is mentioned three times in scripture (Acts 19:22; here; 2 Tim. 4:20). "Erastus" meant "beloved."

Most scholars agree that this is the same Erastus that Paul sent with Timothy into Macedonia (see note 1 at Acts 16:9, p. 667) while Paul remained in Ephesus (see note 3 at Acts 18:19, p. 683). Paul later wrote to Timothy that Erastus abode in Corinth (2 Tim. 4:20) where this verse reveals that he was the chamberlain of that city (see note 9 at this verse).

Note 9 at Rom. 16:23: The word "chamberlain" is only used six times in the Bible (2 Ki. 23:11; Est. 2:3,14,15; Acts 12:20; and here). Of the two times this word is used in the New Testament, Acts 12:20 uses "chamberlain" in the sense of an eunuch who keeps the king's bedchamber. In this verse, "chamberlain" was referring to Erastus being the treasurer of the city of Corinth.

Note 10 at Rom. 16:23: The name "Quartus" meant "fourth." This is the only mention of Quartus in scripture. He was a Christian brother in Corinth who sent greetings to the saints in Rome.