How to Change Your Child's Name in Ontario
From fixing a typo to hyphenating surnames. Understand the difference between a simple Service Ontario application and a contested court motion.
Legal Review: This procedural guide was reviewed by Deepa Tailor, Senior Family Lawyer, to ensure compliance with the Change of Name Act and Service Ontario requirements (2026).
Do I Need the Other Parent's Permission?
Generally, YES. Under the Change of Name Act, all persons with legal custody (decision-making responsibility) must consent to a child's name change.
If the other parent agrees, it is a simple administrative process with Service Ontario.
If the other parent refuses (or cannot be found), you cannot change the name at the registry office. You must hire a lawyer to apply to the Superior Court of Justice to dispense with their consent.
Choose Your Application Type
Joint Election (Consent)
Both parents sign the Service Ontario 'Application to Change a Child's Name.' You mail it in with the fee ($137). A new birth certificate arrives in 6-8 weeks.
Sole Custody (With Order)
You have a final Court Order granting you 'Sole Decision-Making' that specifically authorizes you to change the name without consent. You attach a certified copy of this order to the application.
Contested Change
The other parent refuses to sign. You must file a court application to force the change. The judge decides based on the 'Best Interests of the Child' (not the parents' wishes).
Fighting for a Name Change in Court
Judges are hesitant to remove a parent's surname. The bar is high.
Reasons Judges SAY YES
Abandonment:
The other parent has had zero contact for years.
Safety:
The name change protects the child from a known abuser.
Integration:
Hyphenating the name to include a step-parent who is raising the child (e.g., Smith-Jones).
Reasons Judges SAY NO
Spite:
You just want to erase your ex's name.
Inconvenience:
'It's annoying to have different last names at school.' (Courts rarely care about this).
Identity:
Removing a surname is seen as erasing part of the child's heritage.
What You Need to Apply (Consensual)
The Form
Download the 'Application to Change a Child's Name' (Form 11155E) from the Service Ontario website.
Guarantor
You need a guarantor (teacher, doctor, lawyer) who has known you for 12 months to sign the photo and form.
Police Record Check
Note: The parents usually do not need a police check for a child's name change, unlike an adult change. However, you must declare any criminal history.
Consents
Every person with legal custody must sign. Children aged 12 or older must also sign their own consent.
Name Change FAQs
Related Resources
Sole Decision-Making (Custody)
Understanding sole custody and decision-making authority in Ontario
Step-Parent Adoption (Name Change included)
How step-parent adoption includes automatic name change rights
Paternity Tests & Birth Certificates
Understanding paternity testing and birth certificate amendments
Deepa Tailor
Senior Family Lawyer
Deepa Tailor is the founder of Tailor Law. She assists parents in navigating the bureaucratic and legal hurdles of child name changes, from simple applications to contested court motions.
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