Akkadian

umandu - part of human insides (AHw. 1412)

< *ḥum(a)m-t-? (-nd- < -mt- is not uncommon for SB period [GAG 29]).

*ḥVmm(-at)- - breast, stomach, entrails (SED I No. 119)

Both vocalic and semantic reconstruction is rather amorphous.