Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
West Frisian
fan
←
Proto-Germanic
*fanē
(inherited)
←
Old Frisian
fon
(inherited)
→
Saterland Frisian
fon
(cognate)