“After Jephthah, Ibzan of Bethlehem judged Israel. He had thirty sons. He gave his thirty daughters in marriage outside his clan. Then he brought in thirty young women from outside for his sons. He judged Israel seven years. Then Ibzan died. He was buried at Bethlehem.”
Like Jair in chapter 10, there is a play on words with 30. Ibzan had 30 sons and 30 daughters. Both the sons and daughters married outside his clan. He ruled for only 7 years. He is judge #9. The Bethlehem here is not in Judah, but in Zebulun, near Nazareth since these are northern judges. Could this also be the birth place of Jesus, rather than in Judah?