There doesn't seem to be a widely known person named "Madgar Evers". It's possible you're thinking of someone else, perhaps with a slightly different name or spelling.
If you could provide any additional information, like:
* Any other spellings of the name
* What field they might be famous in (e.g., music, sports, politics, etc.)
* Where you heard the name
I can help you find the person you're looking for!