Bando, Gates, ContiTech. Goodyear made good belts too. I'm willy nilly about Dayco. AZ is now carrying Conti, but I wouldn't be shocked if their V-belts are still Dayco products.
I had to install new V-belts for a lawn roller, A-section belts. The Gates I got off Amazon for that were made in Mexico. The last few Bando belts I've installed were made in Indonesia or Japan.