1943 Due to a player shortage caused by WW II, the Philadelphia Eagles and Pittsburgh Steelers temporarily merged into a single team, playing under the name of Eagles. The team was often referred to in the vernacular as the Steagles; however, the official NFL record book simply lists them as "Phil-Pitt" (NFL)
1974 Philadelphia Bell (World Football League)
1983 Philadelphia Stars (United States Football League)
2004 Philadelphia Soul (Arena Football League)
The Eagles changed owners and stadiums more often than they changed names.