"Evna" is from Evne, which means Ability in Norwegian (and apparently Evna means "their ability" according to Google translate, so that works too). My family is Norwegian, but everyone pretty much abandoned the language, so for a while I was interested in learning it myself. I made multiple RPG character names including "evne". While developing a fictional language, I made the word for ability "Evna", based on the Norwegian word.
"Mishko" is from "MishkoswIn", which means strength in Potawatomi. I originally used it for a character of mine, for her culture was inspired by Native American culture. I liked the sound of it, so I used it as part of my username as well.
So, that makes an approximate meaning of "(their) ability and strength," which is supposed to be sort of a motivational name for myself.