Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cefnder
←
Breton
kenderf
(cognate)
←
Welsh
ceifn
(affix)
←
Welsh
derw
(affix)
←
Cornish
kanderu
(cognate)
←
Old Irish
derbráthair
(cognate)