Think dangerous aircraft, guns or missiles (though preferably not anti-ship missiles - "Exocet closing on the port bow" might provoke an entirely unwelcome reaction from a warship!)
I toyed with loads of names. Anything too long (more than about three syllables) is out, anything that sounds like a Boney M song is obviously out, and anything that would make you sound stupid or like a weekend sailor on the radio is out.
That's where 'Seawolf' came from as it was short and snappy for the radio, and it fits with the theme of being grey and quick
Beretta is good on all of the above. Phalanx is another one that made my shortlist (it's a cannon). Swordfish (plane). Hellfire (missile). Tigerfish (torpedo). I was nearly going to call it Firefox but decided that I'd get bored with people asking me why I named it after a web browser...