the.com/nighthawk

means A nighthawk is either the crepuscular, bug-eating American bird known for its buzzy call and diving display, or, by extension, a person who's habitually active late at night.

from The bird's name is a straightforward 18th/19th-century compound of 'night' and 'hawk' — early namers saw a hawk-like silhouette in flight and assumed hawk-like habits, even though it's not a true hawk at all but a nightjar relative that hunts insects on the wing at dusk. The human sense, 'one who stays up late,' followed naturally once the bird's name was fixed, borrowing its nocturnal reputation even though the bird is really most active at twilight, not the dead of night.