According to the French Wikipedia, which used a book entitled Les noms des Juifs de Tunisie (The names of the Jews of Tunisia) as its source), Lelouch (http://fr.wikipedia.org/wiki/Lelouch) and its close relative Lellouche (http://fr.wikipedia.org/wiki/Lellouche) are North African surnames derived from an Arabic word meaning "lamb." Makes sense, seeing as Claude Lelouch is of Algerian descent.
Oddly, Lelouch Lamperouge doesn't really strike me as being Arabic in the slightest.
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Oddly, Lelouch Lamperouge doesn't really strike me as being Arabic in the slightest.