In the Bible, Jesus referred to James and John as the Sons of Thunder. The name appears in the Gospel of Mark, where Jesus gives the brothers the Aramaic designation Boanerges, translated as “Sons of Thunder.”
James and John were sons of Zebedee and members of Jesus’ inner circle, along with Peter. They were fishermen before becoming disciples. The biblical text does not provide a single definitive explanation for the nickname, so readers have suggested that it may reflect their forceful personalities, passionate temperament, or zeal.
The brothers appear in several important Gospel episodes. They, Peter, and sometimes Andrew are present at events such as the Transfiguration. James and John also ask for honored positions beside Jesus in his coming glory, prompting a lesson about humility and service. Do not confuse “Sons of Thunder” with a family surname: it is a title or nickname, not the brothers’ biological parentage.