Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
roauyr
←
Proto-Celtic
*remros
(inherited)
←
Irish
ramhar
(cognate)
←
Scottish Gaelic
reamhar
(cognate)
←
Old Irish
remor
(inherited)