Ancient Greek ξεῖ

← Ancient Greek φεῖ (link)

← Ancient Greek χεῖ (link)

← Ancient Greek ψεῖ (link)

← Phoenician 𐤎‬ (borrowed)

→ English xi (link)

→ Greek ξι (inherited)

→ Finnish ksii (derived)

→ Italian xi (derived)

→ Russian кси (borrowed)