Ria is a very calm, quiet and petite name just like the girl who has it. The name suits someone who is blonde and shy but has her own cool things about her and a wonderful personality!
My grandmother's name is Marie, but when she was a teenager she went by Ria. Except she spelt it Rhea. But I think if it's spelt like Rhea, it can easily be made fun of, i.e. Rhea diarhea. Yeah gross. But I've heard it be done before.
This is also a nickname for Victoria. If my name was Victoria I'd wanna be called Ria and not Vi like many people are because that is also the nickname of Violet.