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

→ Breton hen (inherited)
→ Welsh hen (inherited)
→ Irish sean (inherited)
→ Irish seanchas (derived)
→ Scottish Gaelic sean (inherited)
→ Manx shenn (inherited)
→ Latin Senones (derived)
→ Old Irish sen (inherited)