Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
ìoc
←
Irish
íoc
(cognate)
←
Manx
eeck
(cognate)
←
Old Irish
ícc
(inherited)
→
Scottish Gaelic
uil-ìoc
(prefix)
→
Manx
eeck
(cognate)