The Zoroastrians hold the belief that the creator of good and the creator of evil are two separate beings. They call the creator of good "Yazdan" (یزدان) and the creator of evil "Ahriman." For this reason, naming a boy Yazdan (Yazdaan) is not permissible.
Allah the Almighty knows best.
Darul Ifta Al-Ikhlas, Karachi.
فیروز اللغات: (مادہ: ی-ز، ص: 1533، ط: فیروز سنز)
یزداں : نیکی اور خیر کا خالق، پارسیوں کا خدا