Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*ɸreswos
→
Welsh
rhew
(inherited)
→
Irish
reo
(inherited)
→
Middle Irish
reód
(inherited)
→
Old Irish
réud
(inherited)