Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
cho
←
Welsh
cyn
(cognate)
←
Irish
chomh
(cognate)
←
Old Irish
com
(inherited)
←
Old Irish
com-
(link)
→
Irish
chomh
(cognate)