Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
brec'h
←
Welsh
braich
(cognate)
←
Ancient Greek
βραχίων
(derived)
←
Ancient Greek
βραχύς
(mention)
←
Cornish
bregh
(cognate)
←
Latin
bracchium
(borrowed)
→
Breton
brec'hioù
(suffix)
→
Breton
divrec'h
(prefix)
→
Breton
arvrec'h
(prefix)
→
Welsh
braich
(cognate)
→
Cornish
bregh
(cognate)