No name bike is more likely to have used a "standard" or more common hanger than one of the brand names. i have no proof, but the brands that like to introduce their own standards (i.e. Cannondale) i suspect more to use their own designs than one of the shelf. Again, i have no evidence of that, just a suspicion.
Assuming you ask about your specific bike, look up at wheelsmanufacturing if one of their 280+ hangers matches yours and buy a spare. My fatbike came with a spare and I have it with my tools just in case.

General bike industry rant:
Why do we have so many hanger types? There is probably an engineering reason to have 5 different ones, but not that boatload of hanger types. No store can keep them in stock and even if you find one they are relatively pricy for what hey are (some soft aluminum)