China and Japan have strong cultures in cryptography and technology

Japan has a strong tradition in technological innovation.

China is extremely advanced in cryptography, mathematics, and also had an active community of cryptographers since the 1990s.

Hidden suggestion in the very name 'Bitcoin'

There are theories that say 'Bit' and 'Coin' may have been inspired by terms circulating in Chinese technology forums in the 2000s.

Hypothesis of the group of companies

There is a funny theory that says the name 'SA-TOSHI NA-KA-MO-TO' may come from:

SA: Samsung

TOSHI: Toshiba

NA: Nakamichi

MO: Motorola

A hypothetical combination of these companies would have created Bitcoin. This theory is seen more as a joke/conspiracy, but it became famous.

Attention to censorship and control

If it were a government or a company, there might be a reason to remain anonymous: to avoid political reprisals and control over the invention.

What is more widely accepted today?

Most scholars believe that Bitcoin was created by an individual or a small group of cryptographers, most likely linked to the cypherpunk community (a pro-privacy and decentralization movement from the 1990s-2000s).

In other words: it was probably not a large official company, but people who wanted to create money free from States and Banks.