Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Breton ki
Proto-Brythonic *ki (inherited)
Proto-Celtic *kū (inherited)
Proto-Indo-European *ḱwṓ (inherited)

Breton kiez (suffix)
Breton dourgi (compound)
Breton gwadgi (compound)
French Tanguy (mention)