They held a contest and the name Seahawks was selected from the submissions. Seahawks were already used by a local high school in Seattle, Chief Sealth. The submitter probably swiped it from them.
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"Seahawk" is one of the nicknames for the osprey - a big raptor that almost exclusively eats fish. Seattle is thick with them.
The Seattle Seahawks were originally going to be called the Seattle Kings. The name was changed to Seattle Seahawks on June 17, 1975.