Yes it is
Yes, the word 'Ali' is a proper noun, the name of a person.A proper noun is the name or title of a specific person, place, or thing.A proper noun is always capitalized.
No they just share a common last name
Laila Ali is the name of Muhammad Ali's daughter.
Ali Movasat's birth name is Ali Mosavat.
Ali Kivircik's birth name is Ali ztemiz.
Lucky Ali's birth name is Masqoom Mehmood Ali.
Rubina Ali's birth name is Rubina Ali Qureshi.
Somy Ali's birth name is Somy Madan Ali.
Vinny Ali's birth name is Vincent Zulfaqar Ali.
Ali Bhutto's birth name is Bhutto, Zulfikar Ali.
Ali Barkin's birth name is Ali Barkin Burkan.
Ali Askari's birth name is Ali Reza Askari.