Template:UsernamePolicy

English Wikipedia username policy summary

Your username must represent you as an individual person

Usernames are not allowed on Wikipedia if they:

only contain the names of companies, organizations, websites, musical groups or bands, teams, clubs, creative groups, or organized events
only describe a particular role, title, position, department, or a group or team of people within a parent organization or group that can be represented or held by multiple people or by different people
are promotional in nature, or appear intended to advertise, promote, sell, gain support, or increase the attention or user-base audience of any person, company, market, product, channel, website, or other good or service
imply that your user account will be shared between more than one person

Your username must be truthful, appropriate, and not foster a negative editing environment

Usernames are not allowed on Wikipedia and will be immediately blocked upon discovery if they:

are offensive, profane, violent, threatening, sexually explicit, or disruptive, or that advocate or encourage any such behavior (including criminal or illegal acts)
contain statements that are libelous, contentious, or disparaging, or that disclose any private or non-public information about somebody else (either another editor, or a notable living person)
are deliberately deceptive, confusing, misleading, unnecessarily long, similar to the username of other accounts, or attempt to impersonate or falsely represent somebody else (another editor, a notable living person, an "official" Wikimedia Foundation account, etc.) in bad faith
imply that the account has explicit ownership of any articles, content, or topic areas, or any kind of "power" or "authority" over other editors, a different application of Wikipedia's policies and guidelines (such as implying that certain policies do not apply to them), or that the account has any administrative or "moderator" access levels or user rights
imply the intent to troll, vandalize, disrupt, advertise, or spam Wikipedia
imply the intent to personally attack, harass, or threaten other Wikipedia users
imply that you are not here to build an encyclopedia or will use Wikipedia for purposes that it was not created for