There are many types of interviewers, and those who really want to get a good sense of who you are might ask this question. This is often a question people ask to get a sense of what your values and aspirations are. There’s certainly no wrong answer -- you can name someone personal or a celebrity -- but being authentic here matters because there’s no point in trying to guess what someone thinks the right answer is. Your reasoning is also probably more important than the name of any individual.