Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
shenn
←
Proto-Celtic
*senos
(inherited)
←
Welsh
hen
(cognate)
←
Proto-Indo-European
*sénos
(inherited)
←
Old Irish
sen
(inherited)
→
Irish
sean
(cognate)
→
Scottish Gaelic
sean
(cognate)
→
Manx
shenn-chaaynt
(compound)
→
Manx
shenn-cheaut
(compound)