In France, there were a period where people perhaps translated, some people even confused with old francs, but nowadays millionaire is about having 1 millions euros. Since euro, we got high inflation for common prices, real asset value inflation and rich people getting a lot richer (in part thanks to the asset inflation). 1 million Franc for an house was quite something 20 years ago, nowadays I can't even imagine buying an house for less than 400.000€.
In Japan, it's very different since 1$ is about 100 yens, so 1 million yen means nothing for private assets. But there is a direct use of the word millionaire (ミリオネア millionea) or the japanese direct translation (百万長者) to talk about annual revenue. It's quite a thing, like 100.000$ salary. There even is movie I would translate to "how to marry a 100.000$ revenue man".
If it's about assets, it will translate to 100 million yens instead of 1 million. It's very simple because there is a word for 100 million : oku (億). So, there are words like okushon (億ション), which means "a 100 millions yen condo" from the contraction of 100 millions (1億円) and mansion (マンション) which is inproperly used for condominium.
