In addition to the father’s surname or the mother’s surname, can I choose the surname of other direct elders?
OK.Article 1015 of the Civil Code:A natural person shall take the father’s or mother’s surname, but in any of the following circumstances, a surname may be chosen in addition to the father’s and mother’s surnames:(1) Selecting the surnames of other lineal elders’ blood relatives;(2) The surname of the person who is chosen because he or she is supported by a person other than the legal supporter;(3) There are other legitimate reasons that do not violate public order and good customs.The surnames of natural persons belonging to ethnic minorities may be subject to the cultural traditions and customs of their own ethnic groups.