Best has explained that "Fujiya" refers to Fujiya, a Japanese manufacturer of record players, and "Miyagi" refers to the character of Mr Miyagi from the film The Karate Kid, because the two names together "just looked really nice written down.
Best explained that "Fujiya" stands for Fujiya, a Japanese manufacturer of record players, and "Miyagi" represents the character Mr Miyagi from The Karate Kid. When combined, these names appeared to be an appealing choice when written down.