18
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6-sextagon
7 - septagon
8 - octogon
9 - enneagon
10 - decagon
11 - hendecagon
12 - dodecagon
13 - triskaidecagon
14 - tetrakaidecagon
15 - pentakaidecagon
16 - hexakaidecagon
17 - heptakai decagon
18 - octakaidecagon
19 - enneakaidecagon
20 - icosagon
30 - triacontigon
40 - tetracontagon
50 - pentacontagon
60 - hexacontagon
70 - heptacontagon
80 - octacontagon
90 - enneacontagon
100 - hectogon / hecatontagon
1,000 - chiliagon
10,000 - myriagon
6-hexagon
7 - heptagon
8 - octogon
9 - enneagon
10 - decagon
11 - hendecagon
12 - dodecagon
13 - triskaidecagon
14 - tetrakaidecagon
15 - pentakaidecagon
16 - hexakaidecagon
17 - heptakai decagon
18 - octakaidecagon
19 - enneakaidecagon
20 - icosagon
30 - triacontigon
40 - tetracontagon
50 - pentacontagon
60 - hexacontagon
70 - heptacontagon
80 - octacontagon
90 - enneacontagon
100 - hectogon / hecatontagon
1,000 - chiliagon
10,000 - myriagon
Edit:
The following are used more often than the ones above.
6 Hexagon
8 Octagon
9 Nonagon
The sides of a polygon do not generally have specific names. Polygons with 3 sides are triangles.
There are infinitely many polygons so it would be impossible to name them all. For the names of those with a fewer sides see the related link.
they came from how many sides are on the polygon
The first ten polygons in order of names and sides are as follows:- Triangle has 3 sides Quadrilateral has 4 sides Pentagon has 5 sides Hexagon has 6 sides Heptagon has 7 sides Octagon has 8 sides Nonagon has 9 sides Decagon has 10 sides Undecagon has 11 sides Dodecagon has 12 sides
Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.