Proto-IE: *tork(')-, *trog(')-
Meaning: he-goat, pig
Old Greek: trágo-s m. `Ziegenbock, Bock'
Latin: troia f. `Sau'
Celtic: *tork- `Eber' > OIr torc, Cymr twrch, OCorn torch, Bret tourc'h
Russ. meaning: скот (кто-то домашнее и грязное)
References: WP I 728 f