Who is he? Or / Who is him?

Which is the correct question form, please?

Who is he?
Or / Who is him?

Are both correct?

Not a teacher.

“Who is he?” is correct.

‘Who is him?’ is not correct in standard grammatical English.

Who is “him”? would be acceptable if you were asking who a person was referring to when they used the pronoun ‘him’. (A shorter, informal version of 'Who do you mean by “him”?)

Thanks I understand now.