Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Germanic
*aikīnaz
→
English
oaken
(inherited)
→
Old English
æcen
(inherited)
→
German
eichen
(inherited)
→
Middle English
oken
(inherited)
→
Luxembourgish
eechen
(inherited)