The name that is given to an 8 sided figure is a octogan.
A six sided polygon is an hexagon
an octagon
octagon
polypothilic
octagon
Nothing need be given to an 8 sided figure!
Normally, 'Octagon' octagon
quadrilateral shape
Icosagon is a 20 sided figure.
The name of a four sided figure (or shape) is called a Square. :)
A 5 sided figure is called a: pentagon