Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
gwayw
←
Proto-Celtic
*gaisos
(inherited)
←
Irish
ga
(cognate)
←
Old Irish
gae
(cognate)
→
Welsh
gwaywffon
(compound)
→
Irish
ga
(cognate)
→
Latin
gaesum
(mention)