←
Proto-Germanic *austrą (inherited)
←
Old High German ōst (cognate)
←
Proto-Indo-European *h₂ews- (root)
←
Proto-Indo-European *h₂ews- (derived)
←
Old Norse austr (cognate)
←
Old Frisian āst (cognate)
←
Old Saxon ost (cognate)
←
Proto-Slavic *utro (cognate)