Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Helm
←
German
Helm
(cognate)
←
English
helm
(cognate)
←
Proto-Germanic
*helmaz
(inherited)
←
Proto-West Germanic
*helm
(inherited)
←
Old High German
helm
(inherited)
←
Icelandic
hjálmur
(cognate)
←
Luxembourgish
Hellem
(mention)
←
Dutch
helm
(cognate)