Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
rhiain
←
Proto-Brythonic
*rriɣėn
(inherited)
←
Proto-Celtic
*rīganī
(inherited)
←
Middle Welsh
rhiain
(inherited)
→
Manx
rein
(cognate)