Mas is a Catalan surname meaning "farmhouse," reflecting the region's agricultural heritage and the traditional Catalan homestead known as a mas. These stone-built rural properties, often self-sufficient estates, are iconic in Catalonia, and the surname likely originated as a topographic name for someone who lived or worked at such a property.The name Mas is most common in Catalonia, Valencia, and the Balearic Islands, areas where masos were historically numerous. The surname simply means "farmhouse" in Catalan, from the Latin mansum meaning "dwelling" or "abode," also related to French mas and Occitan mas. It is an unmodified surname that has been in use since at least the Middle Ages, appearing in records throughout these regions.A related surname in French is Dumas, meaning "of the farmhouse" or "from the farm," also originally used as a locational or topographic surname.Key facts: Meaning – "farmhouse"; Origin – Catalan; Type – topographic surname; Primary usage regions – Catalonia, Valencia, Balearic Islands.