Akkadian

biri - between, amidst, among, in common (CAD B 246; AHw. 128)

There is no trace of *bayna ‘between’ in Akkadian, as its semantic equivalent biri (AHw. 128, CAD B 246) cannot be reduced to *bayna for obvious phonological reasons (contra Brockelmann 1908:498 and HALOT 123 where the etymological relationship between the two forms is tacitly taken for granted) (Kogan 2015:80).