Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
sevel
←
Proto-Brythonic
*stab-
(derived)
←
Welsh
sefyll
(cognate)
←
Proto-Indo-European
*steh₂-
(root)
←
Proto-Indo-European
*steh₂-
(derived)
←
Cornish
sav
(cognate)
→
Welsh
sefyll
(cognate)