Welsh ni

← Proto-Brythonic *ni (inherited)

← Proto-Celtic *snīs (inherited)

← Proto-Celtic *nīs (inherited)

← Proto-Indo-European *[[ne]] [[h₁ésti]] (derived)

→ Welsh i (link)

→ Welsh oni (compound)

→ Middle Irish ní (cognate)

→ Old Irish -ni (cognate)

→ Old Irish sinni (mention)

→ Old Irish ní (cognate)

→ Old Irish -sni (cognate)

→ Old Irish sní (cognate)