I believe what Mickey meant by "group-name" is the name that is on your url. For example if your HipChat url is https://abc-def.hipchat.com then it would be https://abc-def.hipchat.com/admin/export. If you have admin access you can just go to "Group admin" tab>select "Data Export" tab. There you can export the data which has the fist containing what you need.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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