Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
quëllen
←
German
quellen
(cognate)
←
Proto-Germanic
*kwellǭ
(inherited)
←
Middle High German
quellen
(inherited)
←
Old High German
quellan
(inherited)