English Etymology Unexplained. Proper noun Weast (plural Weasts) A surname. Statistics According to the 2010 United States Census, Weast is the 30420th most common surname in the United States, belonging to 768 individuals. Weast is most common among White (94.4%) individuals. Further reading Hanks, Patrick, editor (2003), “Weast”, in Dictionary of American Family Names, volume 3, New York: Oxford University Press, →ISBN. Anagrams Sweat, awest, swate, sweat, tawse, waste, wetasWikiwand - on Seamless Wikipedia browsing. On steroids.