diff --git a/moto/applicationautoscaling/models.py b/moto/applicationautoscaling/models.py
index d3d2a1c6432..426069f8cd8 100644
--- a/moto/applicationautoscaling/models.py
+++ b/moto/applicationautoscaling/models.py
@@ -673,4 +673,6 @@ def update(
         self.end_time = end_time
 
 
-applicationautoscaling_backends = BackendDict(ApplicationAutoscalingBackend, "ec2")
+applicationautoscaling_backends = BackendDict(
+    ApplicationAutoscalingBackend, "application-autoscaling"
+)
diff --git a/moto/elb/models.py b/moto/elb/models.py
index 330bcc6b515..83dc01c3a05 100644
--- a/moto/elb/models.py
+++ b/moto/elb/models.py
@@ -665,5 +665,4 @@ def detach_load_balancer_from_subnets(
         return load_balancer.subnets
 
 
-# Use the same regions as EC2
-elb_backends = BackendDict(ELBBackend, "ec2")
+elb_backends = BackendDict(ELBBackend, "elb")
diff --git a/moto/elbv2/models.py b/moto/elbv2/models.py
index e7081d726e5..7dd4d4d75b8 100644
--- a/moto/elbv2/models.py
+++ b/moto/elbv2/models.py
@@ -1979,4 +1979,4 @@ def _get_resource_by_arn(self, arn: str) -> Any:
         return resource
 
 
-elbv2_backends = BackendDict(ELBv2Backend, "ec2")
+elbv2_backends = BackendDict(ELBv2Backend, "elbv2")
diff --git a/moto/iotdata/models.py b/moto/iotdata/models.py
index 8f25f13f018..88046653827 100644
--- a/moto/iotdata/models.py
+++ b/moto/iotdata/models.py
@@ -221,4 +221,4 @@ def list_named_shadows_for_thing(self, thing_name: str) -> List[FakeShadow]:
         ]
 
 
-iotdata_backends = BackendDict(IoTDataPlaneBackend, "iot")
+iotdata_backends = BackendDict(IoTDataPlaneBackend, "iot-data")
diff --git a/moto/opsworks/models.py b/moto/opsworks/models.py
index 1add8b275e8..a23ade1d36c 100644
--- a/moto/opsworks/models.py
+++ b/moto/opsworks/models.py
@@ -630,4 +630,4 @@ def start_instance(self, instance_id: str) -> None:
         self.instances[instance_id].start()
 
 
-opsworks_backends = BackendDict(OpsWorksBackend, "ec2")
+opsworks_backends = BackendDict(OpsWorksBackend, "opsworks")
diff --git a/moto/signer/models.py b/moto/signer/models.py
index 2c46b07bd08..dced5f59e42 100644
--- a/moto/signer/models.py
+++ b/moto/signer/models.py
@@ -212,6 +212,4 @@ def untag_resource(self, resource_arn: str, tag_keys: List[str]) -> None:
         self.tagger.untag_resource_using_names(resource_arn, tag_keys)
 
 
-# Using the lambda-regions
-# boto3.Session().get_available_regions("signer") still returns an empty list
-signer_backends = BackendDict(SignerBackend, "lambda")
+signer_backends = BackendDict(SignerBackend, "signer")