getOrgUniqueName on crm online

Hi,

I am using the function getOrgUniqueName from https://msdn.microsoft.com/en-us/library/gg334511.aspx#BKMK_getorguniquename to get the org name of the instance.

On OnPrem this works OK, but if I run it on my CRM Online Demo, it returns me something like orgbc01a0fb

My question is, can I set my Org Name on CRM Online ? Or where do I get this value "orgbc01a0fb" from ?

Thanks