Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
morfil
←
Breton
morvil
(cognate)
←
Welsh
môr
(affix)
←
Welsh
mil
(affix)
←
Cornish
morvil
(cognate)
←
Middle Irish
muirmíl
(cognate)
→
Breton
morvil
(cognate)
→
Cornish
morvil
(cognate)