Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-West Germanic
*klaij
→
English
clay
(inherited)
→
Old English
clæg
(inherited)
→
German
Klei
(derived)
→
Middle English
cley
(inherited)
→
Dutch
klei
(inherited)