Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
German
Bö
←
Dutch
bui
(borrowed)
→
German
böig
(suffix)
→
Saterland Frisian
Böie
(cognate)
→
Saterland Frisian
Böije
(cognate)