Account name (a numeric value) shows by default and while this is a required column, most refer to accounts by the friendly name (or Amazon name in AWS). This would need to be enabled for the account or subscription friendly names to be added to reports by default.
You can specify if CloudHealth should use AWS Account Owner ID or AWS Account Name when generating Interactive Reports.
By going to Setup > Admin > Settings, you can update the setting. The next time reports are generated, CloudHealth will update all values for AWS Account to the specified setting. The default setting will continue to be Account Name. Please note, this change will apply for all saved reports in all organizations.