Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Indo-European
*mu
→
Westrobothnian
my
(inherited)
→
Icelandic
mý
(inherited)
→
Swedish
mygga
(inherited)