Short answer. The court takes the first step for you, not the last one. Rule 103, Section 6 requires the court to furnish the judgment to the civil registrar where the court sits, who must then enter it in the civil register — but you should still confirm the entry with the registry that holds your actual birth record.
What the law says
Judgments or orders rendered in connection with this rule shall be furnished the civil registrar of the municipality or city where the court issuing the same is situated, who shall forthwith enter the same in the civil register.
Rule 103, Section 6 — Service of judgment. Read the full provision →
What the court is required to do
Once a court grants a petition for change of name under Rule 103, its job is not finished with the judgment alone. Section 6 places an affirmative duty on the court itself: the judgment or order must be furnished to the civil registrar of the municipality or city where the court sits, and that registrar must forthwith enter the same in the civil register. The registration step is not something the petitioner has to separately request — it follows automatically from the judgment being handed down.
Why the registrar named here may not be the one you expect
A subtlety worth catching: the civil registrar Section 6 refers to is the one in the city or municipality where the court is located, not necessarily the one that holds your original birth record. If you were born in one city but the petition was filed and decided in another, the court's registrar entry and your birth certificate's civil registry office may be two different offices entirely, and coordinating between them can fall to the petitioner in practice even though the statute itself only obligates the court.
A change in how name changes are handled since this rule was written
This rule dates from 1964, when a court petition was the only way to change a name. That changed with Republic Act No. 9048 (2001), later amended by Republic Act No. 10172 (2012), which created an administrative route through the local civil registrar for a change of first name or nickname, or for correcting a clerical or typographical error — no court case required. The judicial petition Rule 103 governs, and the registration duty in Section 6, remain the route for changes that process does not cover, most notably a change of surname.
What to actually do after judgment
In practice, someone who has just won a Rule 103 petition should not assume the paper trail ends with the decision. Confirm that the court has, in fact, transmitted the judgment to the registrar it names, and separately follow up with the civil registry office that holds your actual birth record — including the Philippine Statistics Authority copy — since it is that annotated record, not the court's judgment alone, that most agencies and employers will ask to see.