Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Central Franconian
giehn
←
Middle High German
gēn
(inherited)
←
Proto-West Germanic
*gān
(inherited)
←
Old High German
gēn
(inherited)