I believe the menace are staying so 0% chance it will be the Menace. I believe ProIowa has a website to submit name ideas.
Not sure if the club will or should have a name like 'Menace' or a traditional type of sports team nickname, some USL clubs do some don't... Louisville City FC, FC Tulsa, San Antonio FC, etc. Others take on the name of a major sponsor like United, Red Bulls, etc. They might just leave it at Pro Iowa FC or something, which I'd kind of prefer.