If spock is half human and half vulcan, why do most people refer to him as vulcan and consider him to be vulcan? If that's true, then wouldn't it be just as correct to refer to him as human and consider him to be human? He lived on vulcan and was raised more as a vulcan, but those are just environmental factors. That doesn't change what species he is genetically. I just consider him to be a human/vulcan hybrid, but a vulcan for simplicity, and also because he chose to identify as a vulcan.