Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Proto-Italic *kailom

→ Catalan cel (inherited)
→ Spanish cielo (inherited)
→ French ciel (inherited)
→ Italian cielo (inherited)
→ Latin caelum (inherited)
→ Ligurian çê (inherited)
→ Neapolitan cielo (inherited)
→ Portuguese céu (inherited)
→ Romanian cer (inherited)
→ Sardinian chelu (inherited)