Names

I find it weird when there are kids called Mark and stuff, like yeah, they sound professional when they're older and all, but right now they sound like a baby-man

Its not just names of people. Literally everything in the universe is just an arbitrary title that people have given something.

I called my son baby as his nickname until age 1 since he's my baby but once he was 1 yrs old for a few months I started calling him by his actual name Nicolas and he responds well to it, he knows Nicolas is his name

That sounds a lot like Eragon (if you read the books).

My parents and brothers still reffer to me as "the baby", and I'm about to be 19..