Article 366
RA 386 · Civil Code of the Philippines
ELI5— what this means for you
A natural child acknowledged by both parents shall principally use the surname of the father.
Official text — RA 386
A natural child acknowledged by both parents shall principally use the surname of the father. If recognized by only one of the parents, a natural child shall employ the surname of the recognizing parent.
Source: lawphil.net (RA 386 as amended)
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