Even in English, we may spell a name: "Shaun", "Shawn" or "Sean".
We have words like, "to, too, and two" -- PLUS in English, "we park on driveways" and "drive on parkways". So the English speaking world is just as confusing!
When looking for an Arabic title, many times it might be spelled phonetically -- which is what leads to all the different spellings. It can also lead to spelling out something unintended, so be prudent and corroborative about your sources.