Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*ankus
→
Welsh
angau
(inherited)
→
Irish
éag
(inherited)
→
Scottish Gaelic
eug
(inherited)
→
Old Irish
éc
(inherited)
→
Middle Welsh
angheu
(inherited)