Matthew Poole and continuators on Judges 17:7

7 ¶ And there was a young man out of Bethlehem-Judah , of the family of Judah , who was a Levite, and he sojourned there .

Or, of Bethlehem-Iudah, so called here, as Matt. 2. 1, 5. to difference it from Bethlehem in Zebulun, Iosh. 19. 15. There he was born and bred.

i. e. Of, or belonging to the Tribe of Iudah; not by Birth, for he was a Levite; nor by his Mother, for though that might be true, the Mothers-side is not regarded in Genealogies; but by his Habitation and Ministration. For the Levites, especially in times of Confusion and Irreligion, were dispersed among all the Tribes; and this mans Lot fell into the Tribe of Iudah: which seems to be here noted by way of reflection upon that Tribe, and as an evidence of the general defection, that a Levite could not find entertainment in that great and famous Tribe which God had put so much honour upon, Gen. 49. 8, 9, 10, 11. and therefore was forced to wander and seek for subsistence elsewhere.

So he expresseth it, because this was not the proper, nor usual place of his abode, this being no Levitical City.