Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Frisian
flet
→
English
flat
(cognate)
→
Old English
flet
(cognate)
→
Old English
flett
(cognate)
→
French
flatter
(cognate)