Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
luch
←
Proto-Celtic
*lukoss
(inherited)
←
Welsh
llygod
(cognate)
→
Irish
luch
(inherited)
→
Scottish Gaelic
luch
(inherited)
→
Manx
lugh
(inherited)