Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
gafann
←
Proto-Brythonic
*gasogwona
(derived)
←
Proto-Celtic
*gansis
(cognate)
←
Proto-Indo-European
(derived)
←
Old Cornish
gahen
(derived)