Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
claare
←
Proto-Celtic
*klārom
(inherited)
←
Old Irish
clár
(inherited)
→
Manx
mair-chlaare
(compound)
→
Manx
ard-chlaare
(prefix)