Old Prussian ackis

← Proto-Balto-Slavic *ak- (derived)

← Proto-Indo-European *h₃okʷ- (derived)

← Proto-Indo-European *h₃ekʷ- (mention)

← Lithuanian akìs (cognate)

← Latvian acs (cognate)

← Proto-Slavic *oko (cognate)

→ Lithuanian akis (cognate)

→ Latvian acs (cognate)