Children of the east — That is, the Arabians, who are commonly called the children of the east. Not all the Arabians; but the eastern part of them.
Related Commentaries of Judges 6:3
Judges 6:3
3 And so it was, when Israel had sown, that the Midianites came up, and the Amalekites, and the children of the east, even they came up against them;