Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Germanic
*þek
→
Old English
þec
(inherited)
→
Old High German
dih
(inherited)
→
Hunsrik
dich
(inherited)
→
Swedish
dig
(derived)