Simon Bar Jonas means Simon, son of Jonas. For Example, Jesus
was called Jesus Bar Joseph as his father was Joseph.
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Elymas was called bar-Jesus because "bar" means "son of" in Aramaic, indicating that he was the son of a man named Jesus. It was a way to distinguish him from Jesus of Nazareth and to identify his lineage.
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A guy, a rabbi, and Jesus walk into a bar. The bartender looks
up and says,"Don't tell me this is some kinda stupid joke"