My protagonist’s father owns a very successful restaurant which is getting ready to go national. The working-title I’ve been using is The Crumb, but is that a little too silly? It’s a bistro on [name]Cherry[/name] [name]Street[/name], a swanky art deco part of their town they live in. Please help with any suggestions.
I think The Crumb is actually really cute 
That being said, it doesn’t really feel like a bistro about to go international. Maybe you could call it Crumbles, which is close and a little more sophisticated, and have the father refer to it as “The Crumb” as a pet name
I think The Crumb is too close to crummy. Not a good association. How about The Morsel instead?