Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Breton
guolt
→
Welsh
gwallt
(cognate)
→
Irish
folt
(cognate)
→
Cornish
gols
(cognate)
→
Old Irish
folt
(cognate)