Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
luaith
←
Proto-Celtic
*lowtus
(inherited)
←
Irish
luath
(mention)
←
Old Irish
lúaith
(inherited)
→
Manx
leoie
(cognate)