Since the Christians interpreted the astrological Age of Pisces
as the heavenly sign of God’s kingdom, Christian disciples and missionaries were called fishermen.
Simon Peter also aspired to the title of Messiah as Jesus’ successor after his death.
Peter’s father was not called either John (John 1:42; 21:15ff) or Jonas (Matt. 16:17). In fact, Peter was converted by John’s disciples to faith in Jesus, and Jonas is the prophet Jonah in the eponymous prophetic writings in which the story of Jesus is presented in the Old Testament in the form of a prophetic account.
Peter is both a spiritual son of the church of John and of Jesus the Messiah: that is what the mentions of fatherhood mean. Family relationships such as brother, father and son are often used in the old texts to denote dependency or friendship: cf. also 1 Macc. 12:7.