Maybe meadow garlic.* You can click on the small pics at this site for larger views.
I will say I'm not totally happy with that 'guess'.* I'd suggest you contact your local extension service.* I'm sure it's some type of Allium.
Oh, and you might want to ask these folks too.
I'd love to know what they tell you!
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.