Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Saxon
eggia
←
Proto-West Germanic
*aggju
(inherited)
→
Icelandic
egg
(cognate)
→
Plautdietsch
Akj
(inherited)