Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
sèid
←
Welsh
chwythu
(cognate)
←
Old Irish
séitid
(inherited)
→
Scottish Gaelic
ath-shèideach
(affix)