Actually, the Celts came from Gaul, or modern day France. From that point they traveled to the British Isles, Spain, Turkey and Poland. The Celts in Ireland are actually the most true type of Celt having not been Romanized. If you look at an ancient Roman map you will see three Galatia's. All spelt differently of course. One in Spain, one in Turkey and one in Poland. It is now thought that the Celts, or the Gaul's as the Romans called them, were the dominant people in the British Isles, France and Spain before the Romans took control.
The Celts passed through Gaul, and many stayed there, but they actually originated a long ways to the east. Click on my Profile to find out where they started.