The associated rules namely being against providing fake names to the fuzz (https://thesmokinggun.com/buster/cocaine/tyler-durden-arrest-749230)
QuoteDuring a vehicle stop late Sunday night in Dunedin, a Gulf Coast city, Florida cops discovered a 9mm handgun, ammunition, and "a trafficking amount of narcotics" inside the auto.
Since the gun and the drugs--heroin, cocaine, methamphetamine, marijuana, and Xanax--appeared to belong to a male passenger, Pinellas County Sheriff's Office deputies asked the man to identify himself.
In response, the suspect "provided the name 'Tyler Durden,'" according to an arrest report. Apparently unaware that "Durden" was a character in the 1999 film "Fight Club," cops ran the handle through a police database and "were unable to locate a subject by that name."
Using a fingerprint scanner, police subsequently identified the passenger as Todd Michael Burns, 44, whose rap sheet includes numerous drug convictions, as well as convictions for grand theft, disorderly conduct, violating probation, and carrying a concealed weapon.
Even if they did know the name was from a movie, they still have to run in. It's not impossible for people to be named after fictional characters (or to have their names changed.)