Beroiaios (Βεροιαῖος) is the demonym for a person from Berea — a Berean. It appears once in Acts 20:4, identifying Sopater as "from Berea" (Sopatros Pyrrhou Beroiaios). Sopater was one of Paul's companions who traveled with him from Greece on his final journey to Jerusalem.
Sopater the Berean accompanied Paul carrying the collection from Gentile churches for the poor saints in Jerusalem — a profound act of solidarity across ethnic boundaries. The Berean designation carries a theological echo of Acts 17:11: those who examine the Scriptures become fruitful disciples who serve the whole body of Christ. Sopater represents the fruit of the Berean revival — a believer mature enough to travel with the apostle on his most significant mission. Faithful Bible study produces faithful servants.