Taco Bamba
Dolce Vita
Inca Social
High Side
Giardino Italian Restaurant (Springfield)
Courthouse Social
The Casual Pint
Spartans Family Restaurant (General Manager is alum)
Del Campo Steakhouse (Woodbridge)
29 Diner (Re-opening this year)
Coyote Grill & Cantina - owner went to Lake Braddock HS, has family who went to GMU
Out of the Blue Seafood
Atlas Brew Works
Caboose Brewing (Co-Founder is alumni)
Old Ox Brewery (COO is alumni)
Old Bust Head Brewing Company
Great American Restaurants - Multiple alumni associated with director and leadership roles that oversee their many restaurants.
I'm sure there are way more, these are the ones I know of firsthand.