bucketName

Specifies a name for the bucket. The bucket name must contain only lowercase letters, numbers, and hyphens (-). A directory bucket name must be unique in the chosen Availability Zone. The bucket name must also follow the format 'bucket_base_name--az_id--x-s3' (for example, 'DOC-EXAMPLE-BUCKET--usw2-az1--x-s3'). If you don't specify a name, AWS CloudFormation generates a unique physical ID and uses that ID for the bucket name.