"Azhan" (اَذْہان, with a fatha on the hamza and a jazm on the ذ) is the plural of the Arabic word "Zihn", meaning "intellect" or "understanding". "Azyan" (ازیان, with a fatha on the hamza and a jazm on the ز) is the plural of the Arabic word "Zayn", meaning "beauty" and "adornment". Both names, Azhan and Azyan, are permissible to use, as their meanings are good.
Allah the Almighty knows best.
Darul Ifta Al-Ikhlas, Karachi.
القاموس المحیط: (1199/1، ط: مؤسسة الرسالة)
الذهن، بالكسر: الفهم، والعقل، وحفظ القلب، والفطنة، ويحرك، والقوة، والشحم
ج: أذهان۔
ایضاً: (1204/1، ط: مؤسسة الرسالة)
الزَین :ضد الشین ج:ازیان۔