The appearance reminds me of the Strider, and the Ice Harvester. That makes me think a name related to the Strider would be nice. It also looks like it has a Jet Engine, or some form of cannon for a chest and shoulders (Not the weapons, the topmost part of the arm). It's fists are pretty big, too. From this, the names I can think of are:
Thunder (Or Lightning) Dash(er)
Aching Wave (I originally thought Soundwave, but I think that's a Transformer name.)
The Hypersonic Fist (Or The Hypersonic Punch.)
(I like Thunder Dash the most.)
Some (Like Earsplitter) would probably work better as attack names, though.