Romans 16:23
salute you doth Gaius, my host, and of the whole assembly; salute you doth Erastus, the steward of the city, and Quartus the brother,
Acts 19:22
and having sent to Macedonia two of those ministering to him -- Timotheus and Erastus -- he himself stayed a time in Asia.
1 Corinthians 1:14
I give thanks to God that no one of you did I baptize, except Crispus and Gaius --
2 Timothy 4:20
Erastus did remain in Corinth, and Trophimus I left in Miletus infirm;
3 John 1:1-6
The Elder to Gaius the beloved, whom I love in truth!
Acts 19:29
and the whole city was filled with confusion, they rushed also with one accord into the theatre, having caught Gaius and Aristarchus, Macedonians, Paul's fellow-travellers.
Acts 20:4
And there were accompanying him unto Asia, Sopater of Berea, and of Thessalonians Aristarchus and Secundus, and Gaius of Derbe, and Timotheus, and of Asiatics Tychicus and Trophimus;