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