In Ancient Greek, the "privative alpha" is a negating prefix, cognate to Latin in- (as in "in-conceivable", not "in-flammable") and English "un-". It survives in English in words like "a-typical" and "an-archy".
But when asking this question, about a name with a privative alpha, I realized there's one important thing I never learned. Is that alpha long or short? And is it consistently one or the other, or does it vary?