Free Clouflare plan will give you "Free certificate".
The Free Certificate's Common Name is always pointed to sni.cloudflaressl.com.
You can't change the common name unless you order Advanced Certificate Manager for $10/month.
You can see Advanced Certificate Manager in SSL > Edge Certificates > Order Advanced Certificate:
Sample "Free Certificate":
The certificate's common name is set to sni.cloudflaressl.com but it is valid to all major OS and browser because the Subject Alternative Name (SAN) in the certificate contains your domain.
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