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

→ Breton marc'h (inherited)
→ Gaulish markos (inherited)
→ Welsh march (inherited)
→ Irish marc (inherited)
→ Scottish Gaelic marc (inherited)
→ Cornish margh (inherited)
→ Old Irish marc (inherited)