University of Maryland study quantifies rate of hacker attacks of computers with Internet access. Researchers found the most common password-guessing ploy was to reenter or try variations of the username. “Root” was the top username guess by dictionary scripts 12 times as often as the second-place “admin” Other common passwords attempted included “123456,” “password,” “1234,” “12345,” “passwd,” “test,” and “1” All usernames should never be identical or related to its associated username.”]
Source: https://www.cuinfosecurity.com/top-10-passwords-hackers-love-to-see-a-462