Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
eréischt
←
German
erst
(cognate)
←
Old High German
ēristo
(derived)
←
Luxembourgish
er-
(prefix)
←
Luxembourgish
éischt
(prefix)
←
Dutch
eerst
(cognate)