Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
léimm
←
Proto-Celtic
*lanxsman
(inherited)
←
Welsh
llam
(cognate)
←
Proto-Indo-European
*legʷh-
(derived)
→
Irish
léim
(inherited)
→
Scottish Gaelic
leum
(inherited)