Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
gen
←
Proto-Celtic
*gʷenom
(inherited)
←
Old Irish
gentraige
(link)
→
Irish
gean
(inherited)
→
Scottish Gaelic
gean
(inherited)
→
Old Irish
gentraige
(suffix)