Whether aliens, sapient animals, A.I or posthumans, what exactly do, would and will you refer to them as? They would/could very well be classified as people, but not humans, so would Nonhumans or Nonhuman People/Persons be the best terminology? Of course many people regard the usage of 'people, person, man and woman' to apply to Homo sapiens sapiens or any species in the Homo genus exclusively as people. So would it even be right by most standards to describe them with these words?
In my opinion I would say any entity that displays self-awareness, problem-solving, a sense of rights, ethics and most importantly the want to be classified as a man or a woman should be entitled to Personhood on a de facto level if not a de jure level.