Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
bolg
←
Proto-Celtic
*bolgos
(inherited)
←
Proto-Indo-European
*bʰelǵʰ-
(root)
←
Old Irish
bolg
(inherited)
→
Manx
bolgan
(affix)
→
Manx
aavolg
(prefix)