Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
te
←
Proto-Brythonic
*ti
(inherited)
←
Proto-Celtic
*tū
(inherited)
←
Welsh
ti
(cognate)
←
Proto-Indo-European
*túh₂
(inherited)
→
Breton
da
(mention)