Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-West Germanic
*auwju
→
English
ey
(inherited)
→
Old English
ieg
(derived)
→
German
Donau
(mention)
→
German
Aue
(inherited)