Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
blayst
←
Proto-Celtic
*mlasto-
(inherited)
←
Proto-Indo-European
*mel-s-
(derived)
←
Middle Irish
blas
(cognate)
←
Russian
молса́ть
(cognate)
←
Old Irish
mlas
(cognate)
→
Manx
neuvlayst
(affix)