Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
eent
←
Proto-Germanic
*ainaz
(inherited)
←
Proto-West Germanic
*ain
(inherited)
→
Luxembourgish
Eenheet
(suffix)