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Karin, I've heard it before, brought me to Wikipedia https://en.m.wikipedia.org/wiki/Pseudocydonia... and Karin is how it's called in Japan.
And the confusion has no end, (as quoted from wikipedia):
"Not to be confused with Chaenomeles speciosa, Chinese flowering quince, which, like P. sinensis, is sometimes called mugua.
Pseudocydonia sinensis, the Chinese quince, ... ... is closely related to the east Asian genus Chaenomeles, and is sometimes placed in Chaenomeles as C. sinensis..."