Surname
Ui
Ui (宇井) is a Japanese surname. Its kanji mean house + well, and Wikidata lists 12 notable people with this family name.
う · い · うい
What Ui means
宇
house, heavens
井
well
Where the name comes from
Like most Japanese surnames, Ui describes a place. Its kanji point to a well, the kind of landmark a family was known by when surnames became compulsory for everyone in 1875.