Confidently incorrect

Mariam Webster Mascot a person, animal, or object adopted by a group or groups as a symbolic figure especially to bring them good luck

Masca Indo Germanic
meaning face covering.
Aka the root word of mascara... The witchy connotation comes in from certain type of masks that were worn in the middle ages but does not describe the act of wearing a mask. https://en.m.wiktionary.org/wiki/masca