The term Caucasian is utterly meaningless and comes from the ancient Three Great Races theory. You know, the three great races of which every other race is a subtype: Caucasian, Mongoloid, Negroid.

Here's a helpful map so you can tell who is Caucasian and who isn't:

As for your question: You can see Southern Indians are not yet categorized for certain. Only North Western Indians are certainly Caucasian. Maybe in the future we will learn more about these mysterious people.

Hungarians are Mongoloids by the way.