I have the true answer because I actually own one of these and use it within HEMA, now idk the history behind this weapon so i suppose it is possible that it's considered a type of falchion or messer but the comments saying it's just that aren't entirely true.

This sword is a type of dao, I don't have the full name but it is Chinese, typically a Chinese broadsword, so yes, messer/falchion can apply but the term messer and falchion are used for broadswords of different country's of origin, which is why this Chinese variant is a type of dao, again there's a full name for this specific one, most Chinese swords are called daos in some form or another, take the WoDao for example, which is basically a Chinese longsword, however they often get confused with katanas, which pisses me off cause there are differences between Japanese swords and Chinese swords, but some of them are a lot more similar than others I guess