"Last Name" by Carrie Underwood tells the story of a wild night of partying and making questionable decisions. The song is about a girl who goes out to a club and indulges in too much alcohol, leading to her engaging in casual encounters and waking up the next morning with a wedding ring on her finger. She doesn't even know the last name of the man she married, and her actions have left her feeling ashamed. Despite the consequences, she humorously reflects on the situation and the unexpected turn of events. The lyrics highlight the protagonist's lack of self-control and her willingness to embrace spontaneity without considering the potential consequences. The song showcases the themes of regret, impulsiveness, and the blurred lines between love and lust. Carrie Underwood's powerful vocals and energetic delivery bring the story to life, allowing listeners to experience the narrator's wild night and subsequent confusion. "Last Name" serves as a cautionary tale, reminding listeners to be mindful of their actions and take responsibility for the choices they make, especially when under the influence. The song also carries a message of empowerment as the protagonist ultimately takes control of her situation and decides to leave, leaving behind the unknown man and the confusion of not even knowing her own last name.