Legal analysis: it is illegal. The state protects the legitimate private rights and interests by changing the name on the real estate license without the knowledge of others. Individuals can't change it, and it is impossible to change it, because to change it, all owners must bring the necessary documents and sign on the spot before the real estate management department can handle it.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 102 A natural person enjoys the right to his name, and has the right to decide, use, change or allow others to use his name according to law, provided that it does not violate public order and good customs.

Article 105 A natural person shall take his father's surname or his mother's surname, but under any of the following circumstances, he may choose a surname other than his father's surname or his mother's surname: (1) Choose the surnames of other immediate elders and blood relatives; (2) Choosing the surname of the supporter because of the support of a person other than the legal supporter; (three) there are other legitimate reasons that do not violate public order and good customs. The surnames of natural persons of ethnic minorities can follow their own cultural traditions and customs.