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

→ Catalan seu (inherited)
→ Spanish su (inherited)
→ French son (inherited)
→ Italian suo (inherited)
→ Latin suus (inherited)
→ Ligurian seu (inherited)
→ Portuguese seu (inherited)
→ Romanian său (inherited)