The children of the east, i.e. the Arabians, who are commonly called the children of the east, as Genesis 29:1 Judges 8:10,11 Job 1:3 Ezekiel 25:4. Not all the Arabians, for in that were many and divers people; but in the eastern part of Arabia.
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;