It is impossible to determine if someone named Mila is mean based solely on their name.
The provided reference material offers information about the meaning and origin of the name Mila, not about the personality traits of individuals with that name. The name Mila, in various languages, means "industrious," "hardworking," "gracious," "dear one," or is a diminutive of Milagros, meaning "miracles." These meanings have no bearing on whether someone named Mila is mean or not.
Whether a person is mean depends on their individual behavior, experiences, and personality, not their name.