Side-note: Granted, there is nothing wrong with the sentence "how many are you" per se, but the way he used it was weird. If only I could remember the exact context in which he said it...
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MarvinTheMartianHis mother is Lebanese and his father is a Frenchman.We are many is perfect idiomatic French, Italian, and Spanish. I don't know if the Lebanese connection has any influence over your friend's use of this unidiomatic expression, but I'm sure the French is interfering. Conversely, translating There are many of us literally into