To change a child’s last name in Illinois, you file a petition in the circuit court of the county where you live, give the other parent legal notice, and appear at a hearing where a judge decides whether the new name serves the child’s best interest by clear and convincing evidence. If the judge signs the order, you then use certified copies to update the child’s birth certificate, Social Security record, passport, and other files.
The petitioner must be at least 18 and must have lived in Illinois for six or more consecutive months before filing. That residency rule applies to you, not to the child, and it establishes the court’s authority to hear the case.1
Forms You Will Need
The Illinois Supreme Court Commission on Access to Justice publishes a standardized set of name-change forms that every circuit clerk is required to accept. You can download them from the Illinois Courts website at no cost. For a minor, the core documents are:
- How to Change Children’s Names, the instruction sheet for the process.
- Request for Name Change, the main petition where you list the child’s current legal name, the requested name, your address, how long you’ve lived in Illinois, and the child’s state or country of birth.
- Request for Name Change — Child Information, a supplement with additional detail on each child.
- Order for Name Change, which the judge signs if the petition is granted. You fill in the caption; the judge fills in the ruling.
Enter identifying information carefully. Small mistakes at this stage tend to bounce back from the clerk’s office and push your hearing date out.
Notifying the Other Parent
Any parent whose parental rights have not been terminated is entitled to actual notice and a chance to be heard before a judge rules on the child’s name. Anyone allocated parental responsibilities has the same right. A judge will not sign the order if notice wasn’t handled properly, so this step controls the timeline more than any other.
When Both Parents Agree
If the other parent consents, both of you sign the Request for Name Change and have the signatures notarized before filing. That takes formal service off the table, though both of you still appear at the hearing.
When the Other Parent Objects
If the other parent won’t sign, you file the Request for Name Change along with a Notice of Motion and serve copies on the non-custodial parent by certified mail or through the sheriff in the county where that parent lives. The other parent can appear and object at the hearing, but an objection alone doesn’t defeat the petition. The judge weighs what both sides present against the best-interest standard.
When You Can’t Find the Other Parent
If you genuinely don’t know where the other parent lives, Illinois allows notice by publication. You arrange for a Publication Notice of Court Date for Request for Name Change to run in a newspaper in the county where the case is filed for three consecutive weeks. Line up the publication schedule with the newspaper’s legal-notice department before your hearing date, because the timing has to fit together.
When Notice Would Endanger the Child
In limited circumstances, you can ask the court to waive notice and publication entirely using the approved Motion to Waive Notice and Publication. Grounds include a risk that notifying the other parent would expose the child to physical harm, discrimination, harassment, bullying, or threats of violence. A child who has or previously had an Order of Protection may also qualify. The judge rules on the waiver at your hearing. If it’s denied, you have to go back and provide proper notice before the case can move forward.
Filing and Fees
Illinois requires electronic filing for civil cases, including name changes. You submit your forms through the state e-filing system, which asks you to set up an account and enter payment information. Circuit clerk offices generally have public terminals or staff who can help if you’re new to e-filing.
Filing fees vary by judicial circuit and typically run a few hundred dollars. If you can’t afford the fee, submit an Application for Waiver of Court Fees with your petition. If the court approves it, the fee is reduced or eliminated. Once payment (or the waiver) is resolved, the clerk sets a hearing date.
The Hearing and the Best-Interest Standard
At the hearing, the judge decides whether to grant the change. You’ll answer questions about why you’re asking for it and present any supporting evidence. Some Illinois courts, including Cook County, let petitioners appear by Zoom. Ask your local circuit clerk what remote options are available before the date.
The judge must find by clear and convincing evidence that the new name serves the child’s best interest. That’s a higher standard than the preponderance of the evidence used in most civil cases, so prepare for real questioning. The court considers:
- What each parent wants, and the preferences of anyone with physical custody, including stepparents and step-siblings.
- The child’s own preference and the reasons for it. The judge may interview the child privately in chambers.
- The quality of the child’s relationship with each parent and with anyone else who has physical custody.
- How well the child is adjusted to their current home, school, and community.
No single factor decides the case. If one parent objects, the judge is not required to side with either party; the child’s welfare governs. If the petition is granted, the judge signs the Order for Name Change during the hearing. Ask the circuit clerk for certified copies right away, because those are what every agency will demand when you go to update records.
Restrictions Based on the Petitioner’s Criminal Record
Illinois places specific limits on who can petition for a name change, and these apply to a parent filing on a child’s behalf. Anyone convicted of a felony in Illinois or another state who has not been pardoned must wait 10 years after completing and being discharged from the sentence before filing. Convictions for identity theft, aggravated identity theft, criminal sexual abuse of a minor, sexual exploitation of a child, or indecent solicitation of a child or adult carry a permanent bar unless the petitioner has been pardoned.
People required to register under the Sex Offender Registration Act, the Murderer and Violent Offender Against Youth Registration Act, or the Arsonist Registration Act generally can’t petition during the registration period. A 2024 amendment created exceptions for name changes tied to marriage, religious beliefs, status as a trafficking victim, or gender-related identity as defined by the Illinois Human Rights Act. Even when an exception applies, the judge keeps discretion to grant or deny the petition. The State’s Attorney has 30 days to object to any petition from someone with a pending criminal charge or with convictions for identity theft, sexual abuse of a minor, sexual exploitation, or indecent solicitation.
Updating Records After the Order
The signed order is the starting point. Each agency runs its own process, so plan on handling them one at a time and keep several certified copies on hand.
Birth certificate. Send a certified copy of the order to the Illinois Department of Public Health, Division of Vital Records, along with an Affidavit and Certificate of Correction Request, a copy of your valid government-issued photo ID, and a $15 check or money order payable to IDPH. Expired or unreadable IDs get the request returned.
Social Security card. Report the change to the Social Security Administration with the certified court order and a completed application so the agency can issue a corrected card.
U.S. passport. Passports for children under 16 can’t be renewed by mail, so you’ll apply in person using Form DS-11 at a passport acceptance facility. Bring the certified court order, the current passport, evidence of U.S. citizenship, your photo ID, one passport photo, and the fee. Both parents generally need to appear or provide consent for a minor’s passport, which matters if the other parent’s cooperation is uncertain.
School, insurance, and medical records. Once the core federal and state records are updated, bring certified copies to the child’s school, health insurance carrier, doctors’ offices, and anywhere else that keeps files under the old name. Handling this quickly keeps the child’s legal identity consistent across every system.