@Entity
@Data
@ToString
@NoArgsConstructor
public class Person implements Serializable {
    @Id
    @GeneratedValue
    private Long id;
    private String firstName;
    private String lastName;
    @ElementCollection
    @CollectionTable(name="alternative_name", joinColumns=@JoinColumn(name="name", referencedColumnName = "firstName"))
    List<AlternativeName> alternativeNameList;
}

@Embeddable
public class AlternativeName {...}