我叫埃 尼娜Nina-wo jiao Nina or-我的名字是尼娜

我的名字是niña-Wo jiao niña

妮娜，if 'Nina' is your first name. and if "Nina" is your full name, then it's better to be "倪娜", because 倪 in Chinese is a last name.

your chinese name can be "睨娜". pronounce [ni: na]