EdGrune
Traditionally, US Army/Air Force rotary assets are named for Native American tribes. Osprey is the odd bird (pun)
The Navy and Marines don't do this for their specific rotary aircraft. Sea Stallion, Seasprite, Seahorse, Sea Knight, Sea King and, of course, the Jolly Green Giant.
Osprey doesn't seem out of sorts when you realize the actual bird is also known as a Sea Hawk.
But the helicopter name Seahawk is already used by the Navy's version of the Black Hawk.