Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Saxon
thionon
←
Proto-Germanic
*þewanōną
(inherited)
←
Proto-West Germanic
*þewanōn
(inherited)
→
Old Saxon
githionon
(prefix)