Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
bun
←
Proto-Celtic
*bonus
(inherited)
←
Welsh
bôn
(cognate)
→
Welsh
bôn
(cognate)
→
Irish
bun
(inherited)
→
Scottish Gaelic
bun
(inherited)