Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
teih
←
Proto-Indo-European
*ǵews-
(root)
←
Old Irish
do·goa
(inherited)
→
Manx
aaheiy
(prefix)