Haw. Rev. Stat. § 574-2
The registrar of births shall register any child born in wedlock as having both a family name and a given name chosen by one of the child's parents, or, if the parents do not agree on the name or names, the name or names specified by a court of competent jurisdiction to be in the best interests of the child; provided that the name or names of the child, if already registered on the birth certificate, need not be changed until the court order specifies otherwise. The registrar shall register any child legitimated, as provided in section 338-21, as having both a family name and a given name chosen by the child's parents, or, if the parents do not agree on the name or names, the name or names specified by a court of competent jurisdiction to be in the best interests of the child.
HRS § 574-2