I've tried WhatTheFont, but that came up negative, now trying Identifont.
I've already got that company name. Went for it after Goog Le was gone.
Just curious as to why you need a logo to say YouTube? Or have I misread?
It honestly looks like plain old calibri to me. And as you're new word doesn't have the 'a' in it, or the 'b' no one would be any the wiser.
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What about the b in Tube?
So they would notice the missing slant on the vertical line.