Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle English
ak
→
English
Auckland
(derived)
→
English
querquetulanus
(derived(en/la))
→
English
Querquetula
(derived(en/la))
→
Old English
ac
(link)