Is the ssh key name a part of the authentication? [closed]
Protocol 2 public key consist of: options, keytype, base64-encoded key, comment.
There are actually more parts, but they could be (and almost always are) empty. The last part is comment and could be anything. So the answer to you question is NO, comment is not part of authentication.
You could read more in documentation: http://www.linuxcertif.com/man/5/authorized_keys/#AUTHORIZED_KEYS_FILE_FORMAT_14h