Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
aelwyd
←
Old English
ǣled
(borrowed)
←
Breton
oaled
(cognate)
←
Proto-Germanic
*ailidaz
(derived)
←
Cornish
oles
(cognate)