Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
jiarg
←
Old Irish
derg
(inherited)
→
Manx
jiarg-
(mention)
→
Manx
breck-yiarg
(compound)
→
Manx
fo-yiarg
(prefix)
→
Manx
jargan
(cognate)