As per the standards of international commerce, the majority of consoles created in or imported to Japan, including those targeting uniquely domestic audiences, employ names or acronyms based on the English language. For the sixty odd years that Japan has been producing electromechanic and electronic game systems there is but a literal handful of systems named in the Japanese language that, I'd wager, even the most seasoned players know little or nothing about. Your curiosity may be rewarded if you continue reading.
1982 - Contrary to what you may have heard or read, Tomy was the first Japanese toy company to develop a computer. Styled after the Texas Instruments TI-99/4 and manufactured by Matsushita, the Pyūta was purposely designed to sit on toy store shelf space as hinted at by its name, a childish diminutive of the word Konpyūtā.
1983 - John Ross's Mini-Arcade project was sold world over under the sweet-sounding name Vectrex. The Japanese distributor, Bandai, was not so enamoured with it. Believing that a Japanese name would do better at retail, it was commercialized as Kōsoku-Sen - The Lightspeed Ship!
1988 - Bandai's history as a console maker is quite unlike any other. Terebikko is a VHS-based gaming system that uses the TV audio output to play sound via its phone receiver and quiz players with multiple response questions. The console produces a sound output that informs the player if the answer was correct or not. Tapes include animated films starring Mario, Anpanman and the characters from Dragon Ball, some even fetching quite the high price at auctions these days.
1990 - Sharp is seldom given due recognition for creating some of Nintendo's finest and durable consoles. The Sūpā Famikon Naizou Terebi SF1 TV perfectly mirrors the concept of their 1983 C1 NES TV, in spite of the technological leap. Its Japanese name describes its built-in console function. Nintendo fanboys would pounce on me were I to snub it.
1995 - Further proof of Bandai's unorthodox approach to console design is found in their unsuccessful Denshi Manga Juku - lit. Electronic Manga Tutor. The first ever stylus-based console - once again, contrary to what many may yet hold to be true - some of the games in its miniscule library allowed the player to design and animate characters or scenes; while others presented a blank canvas for the user to draw the game's protagonist.
1996 - A retail development kit, but a console all the same, Sony's Netto Yarōze was an ambitious project resulting in dozens of homebrewed independent titles. The name matches its vision: a network of creators coming together to realize their individual game design aspirations. Of all the systems in its restricted category, it was by far the most successful.
Unreleased - It's a beautiful fact that the first arcade game and globally successful console had a Japanese word stamped on them - Atari. Mirai, meaning Future, is a prototype found in the mid-1990s, about which nothing can be said authoritatively apart it from being a cartridge-based system. Given the more or less overt resemblances to the Atari XEGS, it is possible that it was designed by Ira Velinsky, in which case it could date from the late 1980s. Though not a made-in-Japan product, its borrowing of a Japanese word makes its presence in this list mandatory.