Okay, so you want to know about celtic place-names in Galicia? Let me explain it to you.
First of all, do you know what a place-name is? A place-name is just the name of a place or town. For example, if you live in a town called "Sunnyvale", that's the place-name of your town.
Now, let's talk about "Celtic". Do you remember learning about the Celts in school? The Celts were a group of people who lived a long time ago in Europe. They had their own language, culture, and way of life.
Galicia is a region in northwestern Spain, and it used to be home to the Celts. Even though the Celts are not around anymore, we can still see evidence of their influence in Galicia. One way we can see this is through the place-names.
A lot of the place-names in Galicia have Celtic roots. This means that the names come from the language that the Celts spoke a long time ago. For example, the town of "Lugo" has a Celtic place-name. The word "Lugo" comes from the Celtic word "lucus", which means "sacred forest".
So, to sum it up, many of the place-names in Galicia come from the language of the Celts who used to live there a long time ago.