Philadelphia have release their new emblem and official name.

Philadelphia Union was officially unveiled today as the name of Major League Soccer 16th franchise by Mayor Michael Nutter, with City Hall serving as an appropriately historic backdrop for the momentous announcement.

The region's newest professional sports team simultaneously revealed its logo and colours as the countdown to First Kick continues.

"This is a special day for our devoted fan base and the people of the Greater Philadelphia Region," said Philadelphia Union Principal Owner Jay Sugarman.

"We're incredibly fortunate to have fans who understand the power of loyalty and unity, and our team identity draws its inspiration from them and from the importance these qualities have played in the history of Philadelphia."