Everyone knows mosquito, but in much of Brazil that is not the word people reach for when one is biting them.
Muriçoca is the Northeastern word — Caldas Aulete labels it "(Bras., Nordeste)" — and carapanã is the word across the North, which Priberam marks "[Brasil: Amazônia]". Both often refer to the big, slow, night-flying kind rather than to mosquitoes in general, which is worth knowing if you are trying to complain convincingly.
Pernilongo, the term many southeasterners use, is not shown on this map: both dictionaries label it simply "[Brasil]", so we have no source that ties it to a region. It will appear here when one is found.