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

→ German Eisen (derived)
→ Faroese jarn (derived)
→ Icelandic járn (derived)
→ Norwegian Bokmål jern (derived)
→ Pohnpeian ain (derived)
→ Albanian Erjon (derived)
→ Vilamovian ajza (derived)