A knowledge base article about Guidelines for account (bMail, CalNet) names? provided by the UC Berkeley IT Service Hub - Knowledge Portal
Your CalNet ID is your online identity at UC Berkeley. It is used for system access log-ins and authentication, and it will be your campus email address when combined with @berkeley.edu. (For example, the CalNet ID oski.bear becomes oski.bear@berkeley.edu as an email address).
keep it short -- you will be typing it often
keep it professional -- professors and future employers will see your CalNet ID in your campus email address
make it yours -- since your CalNet ID serves as your username in many campus collaboration systems, consider including all or part of your name
CalNet IDs must meet the following requirements:
Please note that the CalNet ID is a public attribute and is available to campus departments for facilitating access to services. The "private" part of your CalNet credentials is the passphrase, so please be sure that you are the only person who knows your passphrase.
More information on CalNet IDs can be found here.
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For help with your CalNet ID, email calnet@berkeley.edu -- be sure to include your full name, campus ID, and the CalNet ID of the account you need help with.