Not a person so called, but the tribe of Judah, as is manifest from Judges 1:3,4,8,9, which is chosen for the first enterprise, because they were both most populous, and so most needing enlargement; and withal most valiant, and therefore most likely to succeed; for God chooseth fit means for the work which he designs; and because the Canaanites were numerous and strong in those parts, and therefore where in time to be suppressed, before they grew too strong for them.
Related Commentaries of Judges 1:2
Judges 1:2
2 And the LORD said, Judah shall go up: behold, I have delivered the land into his hand.