Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cig
←
Breton
kig
(cognate)
←
Proto-Celtic
*kīkos
(inherited)
←
Middle Irish
cích
(cognate)
→
Welsh
cigfran
(compound)
→
Welsh
cigoedd
(affix)
→
Irish
cíoch
(cognate)
→
Middle Irish
cích
(cognate)