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.
Lots of fun here! The first confusion I have is there is 2 different company names listed on the same page referring to the same Ukulele. As well as Alaya Super Music there is Han Flag Musical Instruments.
The factory itself is located in Zhangzhou, Fujian province and has been in business since 2010. The product list is listed as acoustic Guitars and Ukuleles, Drums and Cajons, and other musical instruments accessories.
For Ukuleles the main brand is Hun, (I have seen it in the descriptions written as Han but the headstock logo always say Hun), and under this branding I have seen Concerts and Tenors in the standard woods with a solid top and laminate back and sides. The other brand name I have seen them use is Alaya but I have only seen this on full size acoustic Guitars.