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Hummingbirds are known for their high-pitched, rapid wing beats that create a humming sound. The sound is produced by the rapid flapping of their wings, which can beat at a rate of 50 to 200 times per second, depending on the species. Hummingbirds are the only birds that can fly both forwards and backwards, and hover in mid-air. The sound is created by the air pressure caused by the rapid flapping of their wings, and hummingbirds use this sound to communicate with other birds, to locate food and mates, and to defend their territory.
So, technically, hummingbirds do not hum as we understand it to be, they produce a humming sound due to the fast flapping of their wings, which is why they are called hummingbirds.