Palit ng apelyido

No, you cannot go back to using your maiden name after you started using your married name without securing an annulment.

Under the Civil Code of the PHilippines:

Art. 370. A married woman may use:

(1) Her maiden first name and surname and add her husband's surname, or

(2) Her maiden first name and her husband's surname or

(3) Her husband's full name, but prefixing a word indicating that she is his wife, such as "Mrs."

Art. 371. In case of annulment of marriage, and the wife is the guilty party, she shall resume her maiden name and surname. If she is the innocent spouse, she may resume her maiden name and surname. However, she may choose to continue employing her former husband's surname, unless:

(1) The court decrees otherwise, or

(2) She or the former husband is married again to another person.

Art. 372. When legal separation has been granted, the wife shall continue using her name and surname employed before the legal separation.

Art. 373. A widow may use the deceased husband's surname as though he were still living, in accordance with Article 370.

Pero once a woman has used her married name (her first name and her husband's last name), she cannot revert to using her maiden name. Read the decision of the Supreme Court in: http://sc.judiciary.gov.ph/jurisprudence/2010/march2010/169202.htm