Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Séi
←
Proto-Germanic
*saiwiz
(inherited)
←
Proto-West Germanic
*saiwi
(inherited)
←
Old High German
sēo
(inherited)
→
Luxembourgish
Mier
(link)
→
Luxembourgish
Séipäerdchen
(affix)