What does Nandi mean in Japanese?

Answer 1

'Nandi' isn't a word in Japanese (easy to tell as there is no 'di' character in any of the writing systems).

Do you perhaps mean 'Nande'? (nan-deh) which would be 'why'

or perhaps 'nan-ji'? (nan-gee) which is what you say when asking what time it is.

Answer 2

奈々さん would be one way of writing a person's name, or 七三, with the same pronunciation would be seven three.

Answer 3

It means what

Answer 4

it is what