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English word myriagon comes from English -gon, English myria-
-gon (English)
(geometry) Forms the names of plane figures containing a given number of angles, and thus bounded by that number of line segments (polygons). If the number is large enough, it can be attached directly to an English numeral with a hyphen.
myria- (English)
(obsolete) In the metric systems of units, multiplying the unit to which it is attached by 10,000. Symbol: my. Innumerable: myriad, myriapod.
myriagon (English)
(geometry) A polygon with 10,000 sides.