Irish gob
Serbian kov

It should be gobae, don't make stuff up. It comes from Proto-Celtic *goban-.

Also, the IE etymology of PCl. root *goban– is unknown. There is a possibility it steems from PIE *gwhobh– or *ghwobh-.

Our word had the form *vronŭ up until the end of the 8th century. The form vran could only be possible from 10th century. Learn a thing or two.

I have to correct my post here.

Psl. *vornŭ turned to *vranŭ (OCS вранъ) , *vronŭ or *voronŭ at the end of the 8th century.

That Slavic word steems from Balto-Slavic BSl. *worwos i.e. from PIE *uor-uo-.