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

→ Welsh llaw (inherited)
→ Faroese lámur (derived)
→ Irish lámh (inherited)
→ Scottish Gaelic làmh (inherited)
→ Manx laue (inherited)
→ Cornish leuv (inherited)
→ Old Welsh lau (inherited)
→ Old Irish lám (inherited)