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

Breton brec'h (cognate)
Welsh braich (cognate)
Cornish diwvregh (prefix)
Cornish konna bregh (mention)
Cornish dywvregh (prefix)