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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No. you simply have to close the old account and start fresh.
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Here is answer in http://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).
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Copyright © 2017 HubPages Inc. and respective owners.