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

→ Breton evn (inherited)
→ Welsh adar (inherited)
→ Welsh edn (inherited)
→ Welsh adain (mention)
→ Irish éan (inherited)
→ Manx eean (inherited)
→ Cornish edhen (inherited)
→ Old Irish én (inherited)