Mehri

bərk - in, at, inside, among (ML 52)

Probably related. Leslau reasonably thinks related to Soq. bérak ‘poitrin’ [LS 95]; for a similar semantic development cf. Mhr. mən ḥəḳ ‘inside’ (prep.) [JM 175] (and related MSA forms) ∼ Sem. *ḥi/aḳ(ʷ)- ‘hip, loin, lap’, No. 113.

PWS

*barak- - chest, thorax (SED I No. 38)

Rather to be separated from *bi/ark- ‘knee’ (SED I No. 39). Note Akk. ‘lap’ in birku, burku [CAD b 255] given as a second meaning; this rather developed from the main meaning ‘knee’ (see *bi/ark- ‘knee’), though it may also ensue from Sem. *barak- ‘chest’.