It is part of being a socialised human being. It is how we make sense of the world. We learn from experience, we draw comparisons, we use information at our disposal, we respond according to experience and instinct and most importantly we adapt that information to each new situation. And thank goodness we do because it's the adaptation of learnt information that aids us and protects us in other situations. It's not a natural instinct that you want to switch off.
What you are doing AuntieMaggie is assuming that it is only a negative thing when it's just a human thing. Yes, it would be negative if you assumed that a name implied something, laboriously stuck to that assumption, used that as your sole basis for reference and allowed it to prejudice your own behaviour and attitudes. If you met siblings named after Shakespearean heroines, you might assume that the parents also liked the literature you enjoyed and it would begin a conversation for example.
What the baby names topic does is isolate that name and ask for reactions solely to it. Of course, presented with a person or a child or a baby with that name, you don't respond solely to a connotation, you respond to the individual.
You must respond to people according to the way they look. You round the corner, for example, a man is sitting on the floor in dirty and frayed clothes with holes in them, his hair is matted, he is slumped staring into the distance. What do you assume? He is homeless probably. What if the same man sitting there was wearing a suit, was clean and had neat hair. If he was slumped on the floor staring into the distance, would you react differently? Make a different assumption? My example is polarised of course to make a point but I refuse to believe you don't make value judgements based on anything other than, well what? Only what somebody says in an immediate situation? We talk about the past, where we come from, our parents, the experiences that shaped us because they make us who we are. Your name and clothes and mannerisms etc are just signposts to that. How you use the information is what makes the difference.
And you're agreeing with flight, but she's still judging. She might be judging the parents but she's judging the child's background nonetheless.