Old Irish é

← Proto-Celtic *es (inherited)

← Proto-Celtic *ēs (mention)

← Proto-Celtic *ēs (inherited)

← Proto-Indo-European *éy (inherited)

← Proto-Indo-European *éy (inherited)

← Old Irish (link)

← Middle Welsh wy (cognate)

→ Irish sé (inherited)

→ Irish é (inherited)

→ Irish iad (inherited)

→ Irish iad (mention)

→ Scottish Gaelic e (inherited)

→ Scottish Gaelic dè (mention)

→ Manx eh (inherited)

→ Old Irish écubus (prefix)

→ Old Irish ésom (affix)