Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Old Irish rét
← Proto-Celtic *rentus (inherited)
← Irish rud (link)
← Proto-Indo-European (mention)
← Sanskrit रत्न (cognate)

→ Irish rud (inherited)
→ Irish réad (inherited)
→ Irish réad (inherited)
→ Scottish Gaelic rud (inherited)
→ Manx red (inherited)
→ Old Irish rétglu (mention)