How can I remove a previously public but now private GitHub repository from showing up on Google Search?

My GitHub repository named “mywebsite-io” (not the actual name) was a public repository for a few months and was indexed to Google Search before I converted it to private.

When searching “” or “mywebsite-io”, the Github URL to the repository bearing my username and full name still shows up on the Google search results, though clicking the link will return a 404 since the repository is already private.

Is there a way to “unindex” the Google search entry so that searching the project name won’t lead to someone knowing that the website was made by me (i.e. my username and/or full name)?

Thank you.