" is asking for a response that describes or explains the action of the verb "know". For example, "I heard it from a friend" is explaining the means by which you know it. " would be asking for a response that describes or explains the action of the verb "call".
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Zenith667I found out that ...It sounds unnatural because nobody says it. You're probably over-analyzing it. Think of it as a fixed expression. When, in English, you want to know the name of something you ask "What do you call (it)?"
It's a bit difficult for me to figure... what does it make it sound unnatural?
Zenith667S