Which judge of Israel is said to have had forty sons?

Answer: Abdon

Abdon son of Hillel from Pirathon had forty sons and thirty grandsons (KJV: nephews) who rode seventy donkeys; he judged eight years.

“After Elon, Abdon son of Hillel, from Pirathon, judged Israel. He had forty sons and thirty grandsons, who rode on seventy donkeys. And he judged Israel eight years.”— Judges 12:13-14 (BSB)