2. Now you know what those who have apostrophe's, al's, ben, ibn, de la, von, etc. have to go through.
3. People in the Indian state of Mizoram don't have last names. Imagine what Southwest and the TSA would do with that.
It's similar with most celebrities, Lady Gaga is known as Lady Gaga by her fans and the media, but she's "Stefani Joanne Angelina Germanotta" to the government and other bureaucratic institutions.
For reference, Mizoram is in the northeast of India. People in some other Indian states, including in the south (where the language and culture are quite different), don’t have last names either. In some cases, they may use an initial (just one letter) that’s derived from the father’s name. In some cases even an initial may not be used (mononym). In visas, the U.S. consulate typically puts a “FNU” or “LNU” in these names, standing for “First Name Unknown” and “Last Name Unknown”, respectively.
Yet within India people are forced to create last names since some specific government issued IDs require that (it’s clear that those were designed by people who didn’t think of catering to the enormous diversity in the country).
Nobody hears about The Artist Now Again Known As Prince being held up at the gate and missing their flight, so there's no corresponding PR backlash that fixes things.