Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle English
helmen
←
Old English
helmian
(inherited)
←
Middle English
helm
(affix)
←
Middle English
-en
(affix)
←
Middle English
helm
(affix)
←
Middle English
-en
(affix)
←
Middle English
helmi
(alter)
→
Middle English
helm
(link)