Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
clacu
←
Proto-Germanic
*klakō
(inherited)
←
Middle High German
klac
(cognate)
←
Proto-Indo-European
*glag-
(derived)
→
Old English
clæcleas
(suffix)