What is the meaning of the name "Layla" (or "Lia"), and is it with a فتحة on the letter ل (laam) or a كسرة, and how is it pronounced, knowing that it is the name of Jacob's wife, Shu'ayb's daughter, and Job's wife?

We cannot definitively ascertain the names of the wives of Ayyub or Ya'qub (peace be upon them), or the daughter of Shu'ayb. This is because what historians mention is transmitted from the People of the Book. It is well-known that Ayyub's wife was named Rahmah. There is no authentic evidence regarding the diacritical mark on the letter "L" (in "Rahmah"), and there is no great benefit in researching this matter.