Latin aper

← Proto-Germanic *eburaz (cognate)

← Proto-Indo-European *h₁ep-r- (inherited)

← Proto-Italic *apros (inherited)

← Proto-Slavic *veprь (cognate)

→ Old English eofor (cognate)

→ Czech vepř (cognate)

→ German Eber (cognate)

→ Old Irish ner (cognate)