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

→ Breton c'hwec'h (inherited)
→ Welsh chwech (inherited)
→ Irish sé (inherited)
→ Scottish Gaelic sia (inherited)
→ Manx shey (inherited)
→ Cornish whegh (inherited)
→ Old Irish sé (inherited)