A 'shout-out' can be regarded as a type of name-dropping where someone's name, or a list of names, is spoken out in order to direct attention towards these groups or individuals, often as a means of expressing kudos or making a referral.
Name-dropping is used to position oneself within a social hierarchy. It is often used to create a sense of superiority by raising one's status. By implying (or directly asserting) a connection to people of high status, the name-dropper hopes to raise his or her own social status to a level closer to that of those whose names he or she has dropped, and thus elevate himself or herself above, or into, present company.
Name-dropping can also be used to identify people with a common bond. By indicating the names of people one knows, one makes known his or her social circle, providing an opportunity for others with similar connections to relate.
As a form of appeal to authority, name-dropping can be an important form of informal argumentation, as long as the name being dropped is of someone who is an expert on the subject of the argument and that person's views are accurately represented.
Use of the first name may be effective, as in the case of "Kingsley" for Kingsley Amis.