Judges 10:4

Thirty sons. This proves almost certainly that he was a polygamist, like Gideon.

Thirty ass colts. In the days prior to the time of Solomon when the Israelites did not own horses, the possession of asses was a sign of wealth and therefore of honor and dignity. This fact is probably recorded to show the rich blessings of a man who had 30 sons, all of whom enjoyed the honor and distinction of riding as chiefs or governors.

Havoth-jair. Literally, “tent villages of Jair.” This name was given to the region in the time of Moses when the earlier Jair captured a number of villages from Og, king of Bashan (Num. 32:41; Deut. 3:14). In the meantime more cities had sprung up or others had been captured, so that when Jair judged Israel he was able to give one to each of his 30 sons, who served as their prefects.