Gigagon?
Giga=billion
I'm not sure, but it seems like the most-likely name.
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There is not a name for such a polygon. A polygon with one million sides is called a megagon though..
megagon (hecatomyriagon)
A twenty-one-ogon.
That can be true of a polygon with ANY number of sides. The only one with a particular name is a scalene triangle.
There is no name for it. A magagon has a million sides though. There's one for you.