At the moment ubbu doesn´t allow students usernames to be edited, due to data protection laws. So when you create student accounts, the platform automatically generates usernames using words and numbers.
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However, to make your teaching experience easier, it is possible to link the real names to the usernames, and store them in encrypted form.

To learn more, see the article https://intercom.help/play_ubbu/en/articles/2531017-connecting-your-students-usernames-with-their-real-names.