Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Breton
goumon
→
French
goémon
(derived)
→
Irish
feamainn
(cognate)
→
Scottish Gaelic
feamainn
(cognate)