Where does “-ōþu” come from?

-ōþu (Proto-West Germanic) comes from Proto-Germanic -ōþuz, from Proto-Germanic -þuz, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Ancestry of “-ōþu”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	-ōþuz	Forms nouns from weak class 2 verbs, possibly...
2	Proto-Germanic	-þuz	Forms result nouns from verb roots, usually from...
3	Proto-Indo-European	-tus	Derives action nouns from verb roots

Words derived from “-ōþu”

yacht
yachting
yachtsman
yot
superyacht
yachtie
megayacht
yachtlike
yachtswoman
yachty
yachter
yachtman
yachtsmanship
yachtless
yachtful
yachtboard
aeroyacht
yachtmanship
yachtsfolk
miniyacht
yate
yacht
яхта
yachtsman

Every word from Proto-Indo-European -tus →

-ōþu — Etymology, Origin & Word History | Etymology Explorer