I live in Japan (as does Kalzameus), my name will regularly cause problems in computer systems. In fact, quite often I'm not using my name but what I am called

I live in Japan (as does Kalzameus), my name will regularly cause problems in computer systems. In fact, quite often I'm not using my name but what I am called in Japanese, and even then it will often fail. Number 1 problem - not enough characters, because most Japanese people only use a few characters for their entire name, don't have middle names, and don't have spaces in their names. And that's just for starters. Should I use what I consider to be my name, my full name, the name on my passport or the name on my residence card…? It's just not that hard to find problems with name inputs.