Akkadian

ḳāḳû - a bird (CAD Q 124; AHw. 901)

OB on

PS
*ḳ(ʷ)aˀ(ḳ(ʷ)aˀ)- - kind of bird (SED II No. 126)
Not quite reliable since independent onomatopoetic formations may have been produced in concrete languages