Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
dâr
←
Proto-Brythonic
*dar
(inherited)
←
Proto-Celtic
*daru
(inherited)
←
Proto-Indo-European
*dóru
(inherited)
→
English
tree
(cognate)
→
Danish
træ
(cognate)
→
Faroese
træ
(cognate)