Keep in mind that Nighthawk is a project created by a independent group of Zcash enthusiasts, not something released from the ECC or ZFND thereby, it seems a bit rude to badger them about a name they chose because they obviously liked it. They have already gone through the trouble of forking the code, customizing the UI, creating Developer apps accounts for Google and iOS store, secured a Twitter handle, designed the logo, and probably several other things that I’m not thinking of.
If you don’t like the wallet simply because of the name then the code is open-source, you are free to do what they did: Fork it to make it your own.