Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Saxon
gerno
←
Proto-Germanic
*gernô
(inherited)
←
Proto-West Germanic
*gernō
(inherited)
←
Old Saxon
gern
(affix)
←
Old Saxon
-o
(affix)