Reconstructions

Proto-MSA
*gdḥ - to come, to drift ashore (Kogan 2015: 553)
The origin is uncertain. Clearly related is Arb. miǯdaḥ- ‘seashore’, but one may doubt that this extremely rare and isolated word is autochtonous in Arabic (Kogan 2015: 553)
Proto-MSA
*gfy - shadow (Kogan 2011: 196)
Proto-MSA
*ghm - to do things in the morning (Kogan 2015:553)
See Kogan 2015:553 for etymological overview.
Proto-MSA
*gḥb - to come ashore (Kogan 2015: 554)
The same meaning for this root is attested in the Arabic dialects of Southern Arabia (Landberg 1901:531, GD 264, Piamenta 61), but it is hard to say whether the MSA terms are borrowed from Arabic or rather the Arabic ones are due to substratum/ adstratum influence of MSA (Kogan 2015: 554)
Proto-MSA
*gāḥiy- - plain, valley (Kogan 2015: 554)
The origin is unknown. Of some interest may be Tna. guḥo ‘cave, crevice or hollow in a mountainside’. For ǯaḥi ‘sol’ in Dathina v. GD 266 (due to MSA influence?)
Proto-MSA
*glw - to be ill (Kogan 2015:554)
The origin of Proto-MSA *glw ‘to be ill’ is unknown. Assuming that the original meaning of the root is “to be hot”, one might tentatively compare Arb. ǯlw ‘to be clear, bright’ (Kogan 2015:554)
Proto-MSA
*gamš- - skink (Kogan 2015:554)
The origin is unknown.
Proto-MSA
*gVpan- - stuffed skin (Kogan 2015:554)
Proto-MSA
*γbr - to meet (Kogan 2015:555)
The origin is obscure. Could it be related to Arb. γbr ‘to remain, to tarry’ with a peculiar semantic development?
Proto-MSA
*γadVw- - depression between mountains, mountain pass (Kogan 2015:555)

The origin is unknown.