Dia is becoming a popular girls name in many cultures. She's either a very cute little girl or a seemingly stuck-up woman until you get to know her. She has lots of class and expects a lot out of any man in her life. She's hard on people she knows but often harder on herself.
People often think her name is short for some other name like Diane but it's not. She also hates to be called Dee.
"Did you see the new girl in the other office? Her name is Dia she's pretty but stays to herself."
"Uh Dia, is that short for Diane?"
An almost sarcastic response to something so seemingly simple you shouldn't have to ask the question to begin with. Could also be an affectionate term meaning again that the answer should be obvious but you just missed it. It is said so quickly, it almost sounds like one long word.
"He's owes me money that's why you haven't seen him. You don't know? He better not come around here".
Guy to his girl "I love you shorty, you don't know?"