Barabbas / Jesus
perhaps a play on words.
Barabbas actually means son of the father.
Jesus had no earthly father. He was known in some places as Mary's son, or son of Mary. In other words a bastard.
The crowds that gathered that day, perhaps with others planted among them to stir up trouble for Jesus, choose a legitimate son over a bastard.
Joseph was Jesus' earthly father. What Jesus didn't have was a human biological father.