There are a lot of Ukulele factories in China, usually in Guangzhou, and whilst some of them make the famous brands that are distributed internationally, (and some don't respect copyright), they also produce other less famous brands that only get very limited distribution. These may be the factory "house" brands or may be a limited trial run and they never really went into production, (but then a trial run of 500 is more than some luthiers will ever make)?
I haven't found the information to be more specific, but some of these brands are as good as the famous ones made along side them so deserve some recognition. Some of the factories will have used more than one of the brand names on otherwise identical models of Ukulele and I am finding the more I look into it that some of these "manufacturers" are really only internet distributors who may be fronts for factories or may be small businesses with a shop on Amazon, Ali Baba or similar market places
Anyway here is what I have found.