You're likely thinking about Cumbrians and Cambrians, both terms referring to people or things related to geographic areas. Here's the breakdown:

* Cumbrian: This term refers to people, places, or things from Cumbria, a county in northwest England.

* Cambrian: This term typically refers to things from the Cambrian Period, a geological period in Earth's history that spanned from 541 to 485.4 million years ago. It's also sometimes used to describe things from Wales, whose ancient Roman name was *Cambria*.

In summary:

* Cumbrian: Relating to Cumbria, England.

* Cambrian: Relating to the Cambrian Period, or sometimes to Wales.

Let me know if you'd like more information about either Cumbria or the Cambrian Period!