It is perhaps a bit superfluous to mention who The Beatles are. Even if you haven’t heard any of their songs (although that’s highly unlikely), you still have undoubtedly heard of them, and it is almost like you aren’t a true musician if you don’t mention “The Fab Four” as influences.
Graphic design, and, in fact, design in general, is an extremely interdisciplinary field. Designers draw their inspiration from many places and many fields, artistic and not. For one designer, their main inspiration source may be illustration and the rich tradition of painting and drawing in Western Culture, while for another design inspiration may come from architecture. To a third, the field they draw most of their creative energy from may be photography.