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

→ Welsh y (derived)
→ Welsh ir (inherited(cy/owl))
→ Welsh hwn (derived)
→ Irish an (inherited)
→ Old Irish in (inherited)
→ Old Irish sin (inherited)
→ Old Irish sund (derived)
→ Old Irish hyn (inherited(sga/cy))
→ Old Irish inunn (mention)