Proto-MSA

*ghm - to do things in the morning (Kogan 2015:553)

See Kogan 2015:553 for etymological overview.

Mehri
gəhēm - to go (a long way); to go in the morning (ML 117)
Mehri
gēhəməh - tomorrow (ML 117)
Jibbali
gɛhέm - to come in the morning (JL 73)
Soqotri
gέhɛm - 1. to accumulate, to gather 2. to enter the pen in the morning; 3. to come home at noon (LS 103, 108; CSOL I 543; CSOL II 463; Naumkin et al. 2015a:68)

di-gέhɛm ‘morning star’: 

ŝéˀe tho míˀšer záḥi yebέḷbeḷ ḷe-di-gέhɛm ‘But I do care about a big he-goat bleating at the morning star.’ (CSOL I 13:5)