Google Urls Buy -
To use a custom URL for a Google Site , you must first own a domain from a third-party registrar like Squarespace, Namecheap , or Hostinger . You then connect it via the "Custom domains" setting in your site's backend.
For developers, Google Cloud Domains allows you to register and manage domains directly within the Google Cloud console, although the underlying registration is still handled through Squarespace Terms of Service. Transition from Google Domains google urls buy
If you previously had a domain registered with Google, here is what you need to know about the current status: Use a custom domain for your site - Google Help To use a custom URL for a Google