I THINK people play around with their discus genetics and ended up with some nice, ugly, ok.etc looking discus, some carry different traits, but if you were to breed them, they should give you that strain because they hold that gene. There are many names flowing within the discus market, fancy names, exotic names, dull names, old school names, you'll name it haha.
Also, one may cross X with Y and decide to name all the offspring after X, but those X discus have the characteristics of Y, hence it does not fully look like X.
Just my vague example haha