The badge design resembles a heraldic shield, and consists of two layers which represent "the partnership between the ownership, the community, the players and the fans". The logo incorporates the Space Needle, an internationally recognized Seattle landmark. The official team colors are Sounder Blue, signifying the waters of the Puget Sound; Rave Green, representing the forests of the Pacific Northwest; and Cascade Shale, representing the Cascade Range to the east of Seattle. Fans chose a name for the team in an online poll held between March 27 and 31, 2008. The initial list of possibilities – Seattle FC, Seattle Republic and Seattle Alliance – deliberately did not include Seattle Sounders in order to provide a fresh start. Despite the names having been selected through fan research and internal committees, the omission of the traditional Sounders name embittered many in the Seattle community.

In response to the backlash, the team added a fourth write-in option for the team name, allowing for any name to be suggested on the ballot.[144] Of the more than 14,500 votes received in choosing the new team name, 49% of the votes included some form of the name "Sounders". Upon announcing the name of the club, Hanauer acknowledged the significance of keeping with tradition: "The team playing at the highest level in our region has always been called Sounders. Starting with the NASL and then the USL 1st Division, we now have the chance to create a separate and distinct identity with the new MLS team." The NASL team was originally named in a public contest, with "Sounders" announced as the winner on January 22, 1974.