There are at least 2 bands that go by the name Staple, one from the US and one from Japan 1:
Staple is a Christian rock/metalcore group from Mechanicsburg, Ohio. Staple was founded in 2000 when the members met at Rosedale Bible College in Ohio.
2:
Staple was a japanese emo band active during the early 2000's.

Read more about Staple on Last.fm.