Yes! The namespace display name "WWW" is for your own convenience and record, so that you know which namespace is for what purpose. When you call keva_namespace, it will always create a unique namespace id, which you should use in your subsequent Keva operations. This is to avoid name squatting, i.e. the popular names are quickly claimed by speculators without intention to actually use (e.g. in the case of Namecoin).

To show all your namespace, use the command "keva_list_namespaces". It will show the display names and their corresponding namespace ids. The unique namespace id always starts with "N".