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There aren't a lot of good reasons for wanting to do this, because it breaks the anonymity of the Anonymous publish/subscribe data flow model. It can be useful for debugging, but building functional logic that depends on the publisher name it is not usually a good idea.

Caveats aside, you can access the publisher name by subscribing to the MessageEvent<msgtype> object (templated on your actual message type), which contains additional metadata in addition to the message data. Have a look at the MessageEvent subsection of the ROSCPP Publishers and Subscribers page for the details.