Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-West Germanic
*aiþ
→
German
Eid
(inherited)
→
Old High German
eid
(inherited)
→
Old Frisian
aththa
(affix)