Storage Account names must be globally unique. The suggestion is to start the name with "cu" to help ensure uniqueness.
In addition to all of the service offerings, storage within Azure has six different redundancy/replication options to choose from :
LRS - Locally Redundant Storage
ZRS - Zone-Redundant Storage
GRS/RA-GRS - Geo-Redundant Storage
GZRS/RA-GZRS - Geo-Zone-Redundant Storage
Within the two Geo Redundant options you can choose Read Access (RA) or not. By default, the redundant copy is not able to be read until Microsoft fails over to the paired region. Choosing "Read Access" allows you to read your data at any time.
This table is a good one :
Documentation :