Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Frisian
dāf
→
Old English
deaf
(cognate)
→
North Frisian
duuf
(derived)
→
Saterland Frisian
doof
(derived)