if you cannot call them by their name. you are holding something back. love or hate.
most of the time it's easy to call someone by their name when you start to know them. continual responsiveness to the brain allows us to understand that sometimes our brain cells get tired of recurruring events, thus the more well rounded we are, it oftens helps us better understand our situations and helps us immitate old matters that need to be restablished from lost memories. certain to say, that if you are welcoming someone, it's better for you to use physical contact by shaking their hand and calling them by their name, even if you know them very well.
I hate most of my managers at times, I hardly ever call them by their names anymore. I want to so bad, tell them that they suck at what they do. then again, I can't tell them they suck because I'll get into trouble. do I still call them by their names, only when I trash talk about them when their not around. my flaw, but that's an example. you hate someone so much, you will not recognize them as a human being.
but if you like-like someone, you may or may not call them by their name, depending on how good your people skills are. even so, when you have a crush on someone, you may say their name too much, at times, mentioning them as much as you could without you actually realizing it.