This research is motivated by a legal vacuum within the Indonesian legal system concerning name changes and the addition of clan names, which creates uncertainty regarding institutional authority and leads to divergent judicial practices. The objectives of this study are to analyze the competent institution for handling petitions for name changes and the addition of clan names, as well as to formulate an appropriate legal resolution mechanism. The research employs a normative legal method, utilizing a statutory approach, a case approach through the analysis of court determinations, and a historical approach. The findings reveal that the legal vacuum compels judges to engage in legal discovery by referring to obsolete regulations that have been revoked, resulting in inconsistent judicial reasoning; consequently, legal reform is required to establish the District Court as the competent authority, operating through a determination mechanism after hearing the considerations of the Public Prosecutor’s Office.
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