Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
uileann
→
Welsh
elin
(cognate)
→
Scottish Gaelic
cathair-uilne
(affix)
→
Scottish Gaelic
uillnich
(suffix)
→
Cornish
elin
(cognate)