The Ruger Standard, MK 1 and MK2 design is kinda based on the form of the Japanese Nambu with just a tad more quality.
Close.
Bill Ruger originally started in 1946 making very nice, high-quality hand-tools: hand drills and such. And they were excellent! Just too expensive for working men to afford.
Anyways, the goal was eventually to start making guns. Unfortunately, the Ruger Corporation went bankrupt and was dissolved in 1949. Ruger would eventually hook up with the Sturm in Sturm-Ruger, which worked out pretty well for all of us.
Anything look familiar? The majority of the Ruger Standard's frame is right there. As for the Nambu, well...I'd say the grip angle is there, and the "beavertail area".
The Nambu and Ruger have similar trigger-bar operations. And, I guess, they both have bolts. However, the Ruger uses an internal hammer to strike its firing pin. The Nambu Type 14 is actually striker-fired, with a short-recoil action. The entire barrel and upper moves forward and back as the gun is cycled!
But ultimately, bolt-operated semiautomatics were really quite common from 1900-1945 or so. Most pistol cartridges were really quite anemic (blowbacks and bolt-operated semiautomatics don't play nice with cartridges in common use today), and they're quite easy to manufacture.
That's not to undersell the importance of the Nambu's influence on the Ruger design. Most military handguns had grip angles frighteningly close to 90 degrees, which is just flat-out difficult to use. The generous trigger guard of the Nambu (especially once it was enlarged after the Japanese invasion of northern China, to allow Japanese soldiers to use the pistol without removing their gloves) is of similar importance. I'd wager that a good portion of today's better-fed shooters would have a difficult time squeezing their sausage-like fingers into the trigger guards of a WW1 European sidearm!