Only two fields need to be unique : The username and nickname.
=> https://trailhead.salesforce.com/content/learn/modules/lex_implementation_user_setup_mgmt/lex_implementation_user_setup_mgmt_adding_users
Yes the Alias has to be unique as it is used in different places of the Org. The alias is a unique identifier used to create the user's email address and also appears in various places throughout the Salesforce platform, such as in chatter posts and comments.
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