Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Sak
←
Proto-Germanic
*sakkuz
(derived)
←
Old High German
sac
(derived)
→
Luxembourgish
Sakgaass
(compound)