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

→ English Kelleher (derived)
→ Welsh cilydd (inherited)
→ Irish céile (inherited)
→ Scottish Gaelic cèile (inherited)
→ Primitive Irish ᚉᚓᚂᚔ (inherited)
→ Old Irish céile (inherited)