Is Yamashita a first name or a last name? or is it both?

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OK OK, given many requests for viewing, I will let you see it once again.

Yamashita(looks kind of like a Hebrew name) is a Japanese surname. Yama means a mountain(it's sea in Hebrew; interesting). It is also the word that appears in Japanese names most frequently. Shita is under. So it's a name relating to geography, which is very common in Japan.
Now answering your question it is exclusively a surname. A name that long or a name that has Yama is a surname, but not a given name.