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

→ Irish inis (inherited)
→ Ancient Greek νειός (derived)
→ Latvian iekša (mention)
→ Latvian pērn (mention)
→ Latvian pērn (mention)
→ Old Irish inis (inherited)