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

→ English Armorica (derived)
→ Welsh ar (inherited)
→ Welsh aros (inherited)
→ Welsh ar- (inherited)
→ Welsh cyfair (mention)
→ Irish ar (inherited)
→ Latin Remi (derived)
→ Latin Arverni (derived)
→ Old Irish ar (inherited)
→ Middle Welsh ar (inherited)
→ Middle Welsh arhos (mention)