Given the task definition and input, reply with output. In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: As the opening credits roll, a band called Flux, apparently with no singer, starts to play at a nightclub. Among the audience is a girl named Courtney Lane. Interspersed with the scenes of the band playing, singer Nikko Alexander calmly walks into the club through the back, barely making his cue for "Don't Tell Me". At the end of the song, he kicks over one of the amps, destroying it for effect. After the performance, the other members of Flux, upset by his carelessness, kick him out of the band; Nikko's girlfriend Amy, who is also in the band, dumps him. After the band members leave, Courtney frantically attempts to recruit Nikko into a show choir named "Spectacular!," of which she is leader. Though Nikko is skeptical and condescendingly rejects her offer, Courtney begs him to come to a carnival to see the choir perform and then make his decision.
What is the last name of Amy's ex-boyfriend?