After I've given a person's name in full, should I use last name only thereafter even if I am writing a work with chapters rather than an essay?

After I’ve given a person’s name in full, should I use last name only thereafter even if I am writing a work with chapters rather than an essay?

Note: This post relates to content in the eighth edition of the MLA Handbook. For up-to-date guidance, see the ninth edition of the MLA Handbook.

Yes, generally follow this guideline, especially for frequently mentioned people or those who are the subject of the work.