Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
bei
←
Proto-Germanic
*bi
(inherited)
←
Old High German
bī
(inherited)
→
Luxembourgish
bäi-
(mention)