For many parents, naming a child can become a stressful process. Perhaps, it’s the pressure of giving a tiny human a name they will have for their entire life. Some families name their kids after a family member, someone famous, fictional characters, or sometimes something that reminds them of a sweet memory. Parents have the right to choose a child’s name. However, that responsibility comes with a few restrictions.

Some states have naming laws and restrictions that define whether new parents are allowed to choose a certain name for their baby or not. According to USBirthCertificates.com, a vital records application preparation assistance service, certain states have other kinds of naming restrictions in place to protect children. This includes banning the use of obscenity in names.

What are some of those baby name restrictions?

Several states limit the number of characters that can be used in a name because of official birth records software used in the U.S. Apparently, in Nebraska first, middle and last names must be less than 100 characters total.

While other states go as far as banning the use of numerical digits or emojis. For example, Massachusetts only allow letters found on the standard English keyboard to be used in baby names. There are also states who prohibit naming children after people who have committed heinous crimes. We don’t know why anyone would, but this means you can’t name your child “Adolf Hitler.”

Many of the common naming restrictions include derogatory terms, obscenity, offensive names, numbers, and certain characters like asterisks. However, there are celebrities like Grimes and Elon Musk who didn’t let their states restrictions stop them from naming their kids Exa Dark Sideræl referred to as “Y” and  X Æ A-XII, nicknamed “X.”

If you are in the “naming” process, you should become familiar with the restrictions set in place by each state to avoid birth certificate surprises.

Here are 6 baby names you probably should avoid.