Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Old Frisian kū

→ Old English cu (cognate)
→ North Frisian kü (derived)
→ North Frisian Kü (derived)
→ West Frisian ko (inherited)
→ Saterland Frisian Ku (inherited)