Irish aithis

← Proto-Celtic *ati-vid-tu- (inherited)

← Proto-Germanic *idiwītą (cognate)

← Proto-Indo-European *éti (derived)

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

← Old Irish aithis (inherited)

→ Irish naomhaithis (affix)

→ Irish aithiseach (affix)

→ Irish aithisigh (affix)

→ Irish dia-aithis (affix)

→ Irish aithiseoir (affix)