People Names

In browsing the web looking for ideas on names for our coming son or daughter, I realized something a little bit silly about the world we live in.

What are some of the titles of Books that list names?
- Cool Names: for Babies
- Best Baby Name Book in the Whole World
- Name That Baby!: Every Parents Guide to Names
- The Baby Name Wizard

My question is: What is a 'Baby Name'?
Is this a name for the child when they are an infant? Does the baby get an adult name later in life? This is a bit puzzling.

Anyway, I'll keep looking for male or female, age irrelevant names.