'Toro' is a cry used in bullfighting. The Texans associate themselves with bulls in many ways. For instance, their mascot and logo are both a bull.
The Colts' main color is blue.
The Steelers are named after Pittsburgh's famous steel industry, steel is often made into steel beams
No special meaning other than a stereotyping of a cowboy
'Roar' is an onomatopoeic word used to describe the noise that lions make
'Viktor' is a traditional Scandanavian name which is also alliterative with 'viking'
The Bills play in the city of Buffalo, 'Billy' is a play on the name 'Bills'
Named after gumbo, a very popular dish in Southern Louisiana
Lighting comes in bolts, the 'Bolts' are also a common nickname for the Chargers
Jaxson De Ville
Named after the city of Jacksonville
T-Rac is a raccoon, and the raccoon is the state animal of Tennessee. 'T' could stand for Tennessee or Titan, 'Rac' stands for raccoon.
Staley Da Bear
Named after A.E. Staley, the founder of the Chicago Bears, originally the Decatur Staleys
'Pat' forms the first part of the word 'Patriot'
'Purr' is an onomatopoeic word used to describe the noise that panthers make
CB, TD, Chomps, and Trapper
Four 'dawgs,' a common nickname for the Browns. Chomps and Trapper are dog names, TD is short for touchdown, CB is short for Cleveland Browns
T.D. is short for touchdown, and is named as the result of a fan contest
Named for Denver's nickname, the 'Mile High City'
Cardinals are red birds, and the team was originally named for the color cardinal, a shade of red
Edgar, Allan, and Poe
Named after Baltimore Poet Edgar Allan Poe, whose poem 'The Raven' is the basis for the team's name
Chief Zee is not an official mascot, but a dedicated fan who is the de facto mascot of the Redskins. The fan's real name is Zema Williams.
Named after a popular Bengals chant, beginning with and often abbreviated 'Who Dey'
An alliterative name incorporating the name of the team
Sourdough bread was so prevalent during the California Gold Rush that Sourdough became a nickname for gold prospectors. Sourdough Sam is an alliterative characterization of a '49er,' one who came to California in 1849 for the gold rush
Eagles swoop down to catch their prey
A charictarization of a pirate captain, since Buccaneer is a nickname for a pirate
'K.C.' is short for Kansas City, 'Wolf' honors the 'Wolfpack,' a nickname for a noted group of rabid fans
Blitz refers to a common defensive tactic in football, but the name is not specific to the Seahawks