One other option would be to create a new hubber then transfer the old hubs there. This will mess up the search engines, however...
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Here is answer in https://hubpages.com/faq/
How do I change my username?
You can not change your username. If you'd rather publish under a different username, you can simply abandon your old account, and create a new one (using a different email address).
You can help the HubPages community highlight top quality content by ranking this answer up or down.
No. you simply have to close the old account and start fresh.
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Copyright © 2017 HubPages Inc. and respective owners.