JackWallet sounds nice. It sounds catchy. Also it's sort of like a car jack is to a car. You use JackWallet to repair your wallet!
I don't think people will value a software to deal with their private keys if its name makes them think about car-jacking.
I'm not an English native though so maybe it's catchy and not scary. If so, could native speakers tell me so?
I don't see a problem with JackWallet but English is not my mother tongue, so you might want to wait for more people to provide you with an answer to your question.