Verse 48: And in the mountains, Shamir, and Jattir, and Socoh…
[In the mountain] In the mountains (Junius and Tremellius). In places of higher elevation (Malvenda).
In the mountains, that is, In the higher grounds, called mountains or hills, in comparison of the seacoast.
Verse 49: And Dannah, and Kirjath-sannah, which is Debir…
[Kirjath-sannah,וְקִרְיַת־סַנָּה ] This city had three names, Debir, Kirjath-sepher, and Kirjath-sannah (Bonfrerius, Malvenda). This name was given to the city from its thorn-bushes (certain interpreters in Masius), that is to say, City of the Bramble; either because it was abounding with brambles, or because some famous bramble was there (certain interpreters in Malvenda). But a thorn-bush is called, not סַנָּה, but סְנֶה. I conjecture, therefore, that ס/Samech/s was put in the place of שׁ/Schin/sh, that it is from שָׁנַן, to whet or to teach, which has regard to the disputations of the Learned, Deuteronomy 6:7 (Masius). שׁנן/Schinan in Chaldean and Syriac is to speak learnedly and acutely; שְׁנִינָה/Schenina is sharpness of intellect. The Septuagint here has the city of letters/writings (Bonfrerius).
Debir is also called Kirjath-sepher, above, verse 15. So this city had three names.
Verse 50: And Anab, and Eshtemoh, and Anim…
Verse 51: (Josh. 10:41; 11:16) And Goshen, and Holon, and Giloh; eleven cities with their villages…
Goshen. See Joshua 10:41.
 Hebrew: וּבָהָ֑ר שָׁמִ֥יר וְיַתִּ֖יר וְשׂוֹכֹֽה׃
 Hebrew: וְדַנָּ֥ה וְקִרְיַת־סַנָּ֖ה הִ֥יא דְבִֽר׃
 סְנֶה signifies a thorny bush.
 Deuteronomy 6:7: “And thou shalt teach them diligently (וְשִׁנַּנְתָּם) unto thy children, and shalt talk of them when thou sittest in thine house, and when thou walkest by the way, and when thou liest down, and when thou risest up.”
 Hebrew: וַעֲנָ֥ב וְאֶשְׁתְּמֹ֖ה וְעָנִֽים׃
 Hebrew: וְגֹ֥שֶׁן וְחֹלֹ֖ן וְגִלֹ֑ה עָרִ֥ים אַֽחַת־עֶשְׂרֵ֖ה וְחַצְרֵיהֶֽן׃