Beroiaios means 'a person from Berea' — a city in Macedonia (modern Veria, Greece). It appears only once in the New Testament (Acts 20:4) to identify Sopater as a Berean among Paul's traveling companions.
While beroiaios itself appears only once, the Bereans themselves (described with the related term) earned enduring fame in Acts 17:10-12. Unlike the Thessalonians who responded with riot, the Bereans 'received the message with great eagerness and examined the Scriptures every day to see if what Paul said was true.' The result: 'many of them believed.' This text has made 'Berean' synonymous with diligent, Scripture-testing faith — the noble posture of receiving teaching with openness while measuring everything against God's word. The Berean model is the antidote to both closed-minded rejection and gullible acceptance: enthusiastic, critical, Scripture-anchored engagement with the gospel.