Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
gwevel
→
Irish
béal
(cognate)
→
Scottish Gaelic
beul
(cognate)
→
Manx
beeal
(cognate)
→
Old Irish
bél
(cognate)