Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
deen
←
Proto-Germanic
*þanōn
(inherited)
←
Old High German
then
(inherited)
←
Old High German
den
(mention)
→
Luxembourgish
der
(mention)