Proto-Slavic *somъ

→ Bulgarian сом (inherited)

→ Czech som (inherited)

→ Czech sumec (inherited)

→ Macedonian сом (inherited)

→ Polish sum (inherited)

→ Romanian somn (cognate)

→ Romanian Somova (derived)

→ Russian сом (inherited)

→ Serbo-Croatian som (inherited)

→ Serbo-Croatian сом (inherited)

→ Slovak sumec (inherited)

→ Ukrainian сом (inherited)