Hey kiddo! So, Rhiannon is a name that some people give to their babies when they are born. It's a really pretty name!
You see, a long time ago, there was a group of people called the Celts who lived in Europe. They had a lot of stories that they would tell each other about gods and goddesses, kind of like fairy tales. In one of those stories, there was a goddess named Rhiannon.
Rhiannon was really special because she was kind and beautiful, but also really strong and powerful. She had a lot of adventures and did things that were really brave and important. She was also known for being really honest and telling the truth, even when it was hard.
So, some parents heard this story and thought that Rhiannon would be a perfect name for their baby girl. And that's how the name became popular!
Nowadays, there are lots of people named Rhiannon all over the world. And each one is unique, just like the goddess she was named after.