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

→ Breton bro (inherited)
→ Cimbrian bröol (derived)
→ Welsh bro (inherited)
→ Welsh Cymru (mention)
→ Welsh Cymro (inherited)
→ Welsh brëyr (mention)
→ Irish brú (inherited)
→ Galician Cambre (mention)
→ Old Irish brú (inherited)
→ Old Irish mruig (inherited)