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Possible Duplicate:
switching which site is primary for a user

How can I change my username in Chat?

I'd like to participate in the chat for a site where I go by Tim, but the chat insists on calling my by my first and last name (which is also what my network profile does).

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Change the parent user of your chat account.

below the about section

I don't believe it is possible to have different names for different rooms on the same chat site.