Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
tusa
←
Irish
tú
(affix)
←
Irish
-sa
(affix)
←
Old Irish
tussu
(inherited)
→
Scottish Gaelic
thusa
(cognate)