Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
seileán
←
Scottish Gaelic
seillean
(cognate)
←
Manx
shellan
(cognate)
←
Middle Irish
teillenn
(derived)
→
Scottish Gaelic
seillean
(cognate)
→
Manx
shellan
(cognate)