According to Turkish Civil Code (Article 187), women take their husbands' surname, but if they want, they can keep their maiden surname. Meaningly, women can not keep their maiden surname without their husbands' surname. But according to Turkish Code on International Private Law and Procedure Law, effects and results of marriage are dependent on where you live together, with other words, your common place of residence. If you live in another country, you should research that country's regulations. If you live together in Türkiye, then you will be subject to Turkish Civil Code.