Vietnamese óc

← Bahnar 'ngok (cognate)

← Besisi ʔatɔk (cognate)

← Proto-Mon-Khmer *ʔuək (inherited)

← Proto-Vietic *c-ʔɔːk (inherited)

← Nyaheun tʔɔk (cognate)

→ Vietnamese đầu óc (compound)

→ Vietnamese trí óc (compound)

→ Vietnamese óc chó (compound)