Contact the sender of that W-2, and be on the lookout for identity theft.
But, did you perchance receive any Third Party Disability benefits in 2020? If so, that W-2 might be from them. Or, your 2020 employer changed names, or was acquired by another company. You can look up that employer on the internet and see if it uncovers anything.
Employment Related Identity Theft | Internal Revenue Service (irs.gov)
