Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
bras
←
Breton
bras
(cognate)
←
Irish
bras
(cognate)
←
Cornish
bras
(cognate)
→
Breton
bras
(cognate)
→
Welsh
penfras
(compound)