Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
fæstan
←
Proto-Germanic
*fastijaną
(inherited)
→
English
fast
(inherited)
→
Old English
befæstan
(prefix)
→
Old English
geliffæstan
(affix)