The point is, a name means a lot! A name identifies who you are.
A name does even more in fiction. There are undertones with a name that not only identifies the character but also says a great deal about what the character does. Really. Think about Hawkeye in Mash.
Sure he said his father named him after a famous Native American, but the writer who created him named him "Hawkeye" not only because of his profession as a surgeon (wouldn't you like a surgeon named Hawkeye operating on you?), but also his keen wit and foresight.
Another thing an author needs to think over while naming characters is sound and the exact meaning of the name. What kind of character do you see when you hear the name Voldemort? J.K. Rowling knew what she was doing naming her villain with sharp sounds. Also Vol de mort means "flight of death" in French.
Now think of the name Hope? Or Sunshine? You have a completely different image and feeling.
Names are a big deal and like the fellow in the video says, you don't have to call me [or your character] Johnson (though Johnson is a great name, don't get me wrong).
What character do you recall who's name had duel meanings and really represented the character as a whole?