I agree. When you look at the names in the NFL, they're not jokey or overly aggressive sounding. Names like Renegades and Roughnecks sound like they're connected to WWE. It's like they're picked to be 'cool' but like you say, they just come off as lame. But yeah, some of the actual logos are pretty cool.
I remember the World League which became NFL Europe. They had some great names and logos when they started, New Jersey Knights, London Monarchs, Raleigh Durham Skyhawks, San Antonio Riders, Barcelona Dragons. There were some bad ones too, but on the whole I think they did a good job with that, and some of the uniforms were actually to the standard of the NFL IMO