Despite searching, the name "Zisha" (ذیشا, Zeeshaa) could not be found in Arabic dictionaries. Therefore, a different name with a clear meaning should be chosen instead. It is best to select a name from among the names of the Prophets (peace be upon them), the Sahabah (may Allah be pleased with them), or the pious, as this is not only more virtuous but also a source of blessing.
Allah the Almighty knows best.
Darul Ifta Al-Ikhlas, Karachi.