Hello, and thank you for your feature request regarding allowing store and brand names as surnames for designers. This idea was previously brought up by another resident, and we are merging your comments to get to it faster. We understand the importance of having professional and consistent last names for business avatars, and we appreciate your detailed suggestions. We have no estimate when it may be implemented, but please keep an eye on future updates. Your input is invaluable, and we hope you continue to share your ideas to help improve Second Life. Thank you!