Old Irish sí

← Proto-Celtic *sī (inherited)

← Welsh hi (cognate)

← Proto-Indo-European *só (derived)

← Proto-Indo-European *íh₂ (mention)

← Old Irish sissi (link)

← Old Irish síi (mention)

→ Welsh hi (cognate)

→ Irish sí (inherited)

→ Scottish Gaelic i (inherited)

→ Ancient Greek ἵ (cognate)

→ Old Irish ol (mention)