From Sum. BAR.DA “crosspiece, crossbar” (PSD B 117).
Probably a Hurrian word of an ultimate Indo-European (Mitanni-Aryan) origin.
No etymology can be suggested.
From Sum. BAR.SAL (describing a sheep, PSD B 125).
The origin of Akk. barsillu (the reading barsīlu is also possible) is obscure.
The Akk. word is attested once in a late lexical list (if the restoration is correct) where it corresponds to Sum. (dug)BAR.si-il-la “cracked pot” (cf. PSD B 128, Sallaberger 1996, 98). The exact pronunciation of the Akk. word is uncertain. It appears to be a late “learned” borrowing from Sumerian (III or later).
According to Limet 1976, 24, it could be a loanword from Sum. BAR.SI 'an emmer flour' (PSD B 127).
Or bāru, barru. No etymology can be suggested.
Cf. bussumu 'pleasant' (CDA 50).