This was the name of 3 biblical men.
Justus, a longtime disciple of Christ who was an eye-witness of His resurrection
“They must have been among the earliest disciples of Jesus, and must have been faithful to the end; they must have been well known and esteemed among the brethren. What became of them afterwards, and what work they did, are entirely unknown” (Lindsay's Acts of the Apostles).
Justus, a Jewish Christian, also called Jesus