Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
eaisht
←
Irish
éist
(cognate)
←
Scottish Gaelic
èist
(cognate)
←
Middle Irish
éistid
(inherited)
←
Old Irish
in·túaisi
(inherited)
→
Manx
aa-eaisht
(prefix)