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Most shapes. For example, triangles, pentagons, hexagons, heptagons, 8-gons, 9-gons etc; circles, ellipses, ovals and other random meandering curves.
A prism whose ends are 18-gons.
None, because there is no such thing
There are names made up of standard prefixes and sufixes for polygons of virtually any numbers of sides. While octacontakaitetragon is the name of an 84 sided polygon and a triacontakaitrigon is a 33 sided polygon, it is customary and far more practical to call them 84-gons or 33-gons.
Your Grand Uncle(great uncle) would be your grandmother or grandfathers brother.