Взгляните на справочную страницу для bash. Там вы найдете раздел под названием Расширение Тильды:
If a word begins with an unquoted tilde character (`~'), all of the characters preceding the first unquoted slash (or all characters, if there
is no unquoted slash) are considered a tilde-prefix. If none of the characters in the tilde-prefix are quoted, the characters in the tilde-pre‐
fix following the tilde are treated as a possible login name.
Таким образом, вы, вероятно, получили все свои возможные имена для входа.