When an illegitimate child is born, it is likely that he will be given his mother’s last name as his last name. In which case, the middle name field on his certificate of live birth will be left blank.
There are two possible scenarios to be observed when correcting or supplying a middle name on an illegitimate child’s birth certificate:
a. If the child is acknowledged by the father.
To supply the omitted middle name on the child PSA birth certificate, a supplemental report should be filed. The supplemental report may be filed by the owner of the birth certificate (if of age), his spouse, children, his parents, siblings, grandparents, guardians, or any other person duly authorized by law or by the owner of the birth certificate.
If the owner was born in the Philippines, he needs to file the supplemental report at the LCR office where his birth was registered. If born abroad, he needs to file this at the Philippine Consulate of the country where he was born. In case he is already permanently residing in the Philippines, he needs to provide supporting documents which shall then be forwarded to the Department of Foreign Affairs.
b. If the child is not acknowledged by the father.
If the child’s biological father fails to acknowledge the child, the middle name shall not be supplied anymore and the child shall carry his mother’s maiden last name as his last name.
On the other hand, legitimate children should always have a middle name indicated on their birth certificates. In case this entry is missing, a supplemental report, containing the reason why the child’s middle name was omitted, must be filed at the LCR where the child’s birth was registered.