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

→ Breton me (inherited)
→ Gaulish mi (inherited)
→ Welsh i (inherited)
→ Welsh mi (inherited)
→ Welsh fi (inherited)
→ Manx mee (inherited)
→ Cornish my (inherited)
→ Old Irish mé (inherited)