This simple python script will update the Name tags of EBS volume with attached EC2 instance Name tag.

tag-ebs-with-ec2-tagName.py

import boto3
ec2 = boto3.resource('ec2',region_name='us-east-1')
for volume in ec2.volumes.all():
    vol = ec2.Volume(volume.id)
    ebsId = volume.id
    for v in vol.attachments:
        ec2Id = v["InstanceId"]
        ec2instance = ec2.Instance(ec2Id)
        if ec2Id is not None:
            for tags in ec2instance.tags:
                if tags["Key"] == 'Name':
                    instancename = tags["Value"]
                    print(instancename)
                    volume.create_tags(Tags=[{'Key': 'Name','Value': instancename},])