Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
of
→
Irish
amh
(cognate)
→
Scottish Gaelic
amh
(cognate)
→
Manx
aw
(cognate)
→
Old Irish
om
(cognate)