If you intend to change your last name once you are married, that can usually be done through the marriage process. Once you receive your marriage certificate, it will be your responsibility to notify certain government agencies and update your official identification documents with your new legal name.

A person is generally allowed to change their first name, last name, middle name, or full name—provided the name change is not for a fraudulent purpose or to avoid creditors. The process is often initiated by filing a name change petition in court and providing notice of the name change to government agencies such as (1) the state department of motor vehicles or department of public safety that issues driver’s licenses and (2) the U.S. Social Security Administration.

State voter registration records and passport information (U.S. Department of State) will also need to be updated to reflect a name change.

Some states—such as California—allow a person to change their name simply by using a different name in all aspects of their life. This is known as the usage method for name change. But government agencies will often require a court order as official proof of a name change, so it is generally best to follow that process.

A person may seek a name change for a number of reasons. Following marriage, one spouse will often change their last name to the other spouse’s last name. And one or both spouses generally may change their name following divorce. A person may also change their name to match their gender identity. And the name of a minor child may be changed—often when a parent remarries and the parent’s new spouse adopts the child.

Name change laws vary from state to state and are usually located in a state’s statutes—often in the family code or domestic relations code.

In Oklahoma, changing your last name after marriage is a straightforward process that can be done through the marriage certificate you receive. After marriage, you must notify government agencies such as the Oklahoma Department of Public Safety for driver's license updates and the Social Security Administration for social security card updates. For other name changes, including first, middle, or full name changes, you must file a petition with the court and provide notice to the relevant government agencies. Voter registration and passport information must also be updated to reflect the new name. Unlike some states like California, Oklahoma does not recognize the usage method for legal name changes; a court order is typically required. Name changes can occur for various reasons, including marriage, divorce, gender identity alignment, or the adoption of a minor child by a step-parent. The specific procedures and requirements for name changes are governed by state statutes, which in Oklahoma can be found in Title 12 of the Oklahoma Statutes (Sections 1631 - 1637).