Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
muimme
←
Proto-Celtic
*mammā
(inherited)
→
Irish
mam
(cognate)
→
Scottish Gaelic
muime
(inherited)
→
Manx
mimmey
(inherited)