Celebrities can't just check into a hotel under their real name unless they want to be mobbed. That's why so many famous people use aliases when they check in. The name they choose is rarely random though and it can often say a lot about who they are -or at least how they want people to see them.
Some celebrities like to go a little silly with their names -for example, Brad Pitt likes to use the moniker "Bryce Pilaf"and Johnny Depp is a fan of "Mr. Drip Noodle, Mr. Oddpong and Mr. Stench." Justin Timberlake's go-to name is a bit more clever as he likes to use "Mr. Woodpond." Meanwhile, Kid Rock's name is a tribute to Batman as he goes by "Dick Grayson" -Robin's birthname.
You can read the fake names of more celebrities over at Travel and Leisure.