First off if you knew some Buddhist history you'd know that Buddha's birth name is Siddartha Gautama. Hesse's character is based off him, they had identical early lives. However, Hesse took the liberty of designing the book's character's journey to enlightment; seeing as there is little documentation of that period of Siddartha's life. All we really know is how his life began, and that is what Hesse uses as a launching point. The journey is fictional.
Siddartha does not meet the actual Buddha, he meets an enlightened leader by the name of Buddha. However, his name is given to him to allude to the future of Siddartha and one of the book's messages. Enlightenment is not something attained on a universal path, it is an individual journey.
-AndrewP
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Per solitudinem ardere in remedium formidinis dictitabat.
Define to me a waste of space.