Why do we have a name?

Identification.

[youtube=https://www.youtube.com/watch?v=Bzq4YDt7V-o]

How do I call you out among a group of people if I don't have something unique assigned to you?

To identify ourselves is one reason

Maybe a number would be more suitable ?

Because "hey you" isn't going to get the job done.

Hey you is rather impersonal

Cause our parents are evil bastards

Because saying “hey you” into a room full of people would get confusing.