Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
kador
←
Welsh
cadair
(cognate)
←
Ancient Greek
καθέδρα
(derived)
←
Latin
cathedra
(borrowed)
→
Welsh
cadair
(cognate)
→
Manx
caair
(cognate)