You may be curious why the word "Ling" was added, because there was a TV series "Ling Tangyuan" in the early 1990s, which talked about the old name "Ling Tangyuan" (it basically existed outside the TV series, but it was just called "Lin Tangyuan"). After the TV series was broadcast, several manufacturers scrambled for the trademark "Ling", but Sanquan Company failed to grab it, and later registered "Sanquan Ling".
Therefore, "Sanquanling" is a trademark of Tangyuan in Sanquan Company, not a subsidiary. Sanquan also has other Tangyuan such as "New School Tangyuan" and "Really Love Tangyuan". But dumplings are directly called "Sanquan dumplings", and there is no such thing as "Sanquanling dumplings" at present.