Question Summary:
Is it Ya Zal Jalale Wal Ikram or Ya Zul Jalale Wal Ikram?

Question Detail:

Is it Ya ZAL Jalale Wal Ikram OR Ya ZUL Jalale Wal Ikram?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
The correct pronunciation is “Ya Zal Jalali Wal Ikraam”.[1]
And Allah Ta’āla Knows Best                                       
Ismail Desai,
Student Darul Iftaa
Durban, South Africa
Checked and Approved by,
Mufti Ebrahim Desai.