Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
çheu
←
Irish
-
(cognate)
←
Scottish Gaelic
taobh
(cognate)
←
Old Irish
táeb
(inherited)
→
Manx
yl-heuagh
(affix)
→
Manx
co-heuagh
(affix)