Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
-iau
←
Breton
-ioù
(cognate)
←
Cornish
-yow
(cognate)
→
Breton
-ioù
(cognate)
→
Welsh
nosweithiau
(affix)
→
Welsh
dyddiau
(affix)
→
Welsh
faniau
(affix)
→
Welsh
breichiau
(affix)
→
Welsh
ffeithiau
(affix)
→
Welsh
pleidiau
(affix)
→
Welsh
blodiau
(affix)
→
Welsh
prifeiriau
(affix)
→
Welsh
clustiau
(affix)
→
Welsh
ffrindiau
(affix)
→
Welsh
dreigiau
(affix)
→
Welsh
ffilmiau
(affix)
→
Welsh
gweithiau
(affix)
→
Welsh
clybiau
(affix)
→
Welsh
cyrsiau
(affix)
→
Welsh
cyfrineiriau
(affix)
→
Welsh
bariau coffi
(affix)
→
Welsh
bariau
(affix)
→
Welsh
cadeiriau
(affix)
→
Welsh
damweiniau
(affix)
→
Welsh
waliau
(affix)
→
Welsh
cotiau
(affix)
→
Welsh
cotiau
(affix)
→
Welsh
bryniau
(affix)
→
Welsh
ffensiau
(affix)
→
Welsh
-eidiau
(compound)
→
Welsh
sgwariau
(affix)
→
Welsh
hwyliau
(affix)
→
Welsh
aeliau
(affix)
→
Welsh
anghytgordiau
(affix)
→
Cornish
-yow
(cognate)