Do 2 objects creating serial queues with the same name share the same queue
As Apple's documentation states, the label is:
A string label to attach to the queue to uniquely identify it in debugging tools such as Instruments...
It is used as a hint, nothing more.
EDIT
Here's the code you want for using a shared queue.
+ (dispatch_queue_t)sharedQueue{ static dispatch_queue_t sharedQueue; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ sharedQueue = dispatch_queue_create("MyQueue", NULL); }); return sharedQueue;}
dispatch_queue_create does exactly what the name suggests, it creates a dispatch queue. The label you give it is not required to be unique, it is just used for debugging purposes.