Either by or as By what other name is Vitamin C known? What other name is Vitamin C known as? [ When I was in Cuba recently, the locals talked about Vitamin R.
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Anonymous Is this question correct?By what other name is Vitamin C known as?ThanksOmit "as" at the end. You already have the preposition "by". You can't answer "... is known as by ...", which your question, as written, invites the listener to do.