The best name seems to be hendecagon (from the Greek word for "eleven").
See http://mathworld.wolfram.com/Hendecagon.html.
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hendecagon
A quadrilateral is a closed plane figure with four straight sides.
An 8-sided plane figure is an octagon.
A expample of a plane figure with 6 sides and 6 vertices is called a hexagon. hex means 6.
It is a dodecagon