Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
jeh
←
Proto-Celtic
*dī
(inherited)
←
Proto-Indo-European
*de
(inherited)
←
Old Irish
di
(inherited)
→
Scottish Gaelic
de
(cognate)
→
Scottish Gaelic
dheth
(cognate)
→
Manx
jehsyn
(suffix)