Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
seechen
←
German
seichen
(cognate)
←
Middle High German
seichen
(inherited)
←
Old High German
seihhan
(inherited)
←
Dutch
zeiken
(cognate)