Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-West Germanic
*dauw
→
English
mildew
(affix)
→
Hunsrik
Daa
(inherited)
→
Luxembourgish
Da
(derived)
→
Saterland Frisian
Dau
(inherited)
→
Yola
dhew
(inherited)