You're dealing with video games and motion pictures, fer chrissake . . . get some perspective.
Masamune is the name of one of the most famous of Japanese swordsmiths--which is to say, he was a real person, and
a Masamune simply means a sword which was made by him (mid 14th century).
In [i]The Historical Masamune[/i], Jason Dingledine wrote: The historical Masamune's familiar name is Goro Nyudo. Masamune is probably the best known Japanese swordsmith of all time, as well as a well-known philosopher.
Masamune is believed to have worked in Sagami Province during the last part of the Kamakura Era (1288 - 1328), and it is thought that he was trained by swordsmiths from Bizen and Yamashiro provinces, such as Kunitsuna and Kunimitsu.
The first famous swordsmith active in Kamakura, Sagami province was Shintogo Kunimitsu. It is claimed (in Kanchiinbon Meizukushi) that he was a grandson of a swordsmith of the Taima school in Yamato province. It is generally accepted that Kunimitsu had two pupils, Yukimitsu and Masamune. The earliest among Kunimitsu's works are those reliably dated to1293 and the latest dated 1324. Judging from the dates of Kunimitsu's works, Masamune was active from the end of Kamakura to the very early years of the Nanbokucho period.
Masamune is credited with creating the Soshu tradition of swordmaking during his career. Masamune's adopted son, Sadamune succeeded him as master of the Soshu tradition.
Reality is always far more interesting than the paltry creations of some cinematic hack's imagination. I suggest that you do online searches for the words and names you have accumulated from these game and movie sources, and avoid sites which refer to the games of the movies. You might then learn a great deal about katanas and how they were made and who made them.
Reality always is more interesting and compelling than fiction, but it requires some work to get to it, because nobody is peddling it to you the way games and novels and movies are peddled . . .
:wink: 
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