It's perfectly acceptable to call it a 127-agon but what's more important is knowing how to work out its properties.
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according to my geometry teacher, it is called a 127-gon
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
The name of a 9 sided polygon is Nonagon.
The name of a 19 sided polygon is enneadecagon.