You should have seen Taiwan in the 1990s. It was a hot mess of older Western romanization systems, historical and dialectical exceptions, competing Taiwanese and pro-China sensibilities, a widely used international standard (pinyin), and lots of confusion in official and private circles about the proper way to write names and locations using the Latin alphabet. In 1998, the City of Taipei even made up its own Romanization system for street names at the behest of its then-new mayor, a supporter of Taiwan independence (https://pinyin.info/news/2019/article-on-early-tongyong-piny...).

The chart halfway down this blog post lays out some of the challenges once the hanyu pinyin standard was instituted in 2009:

https://frozengarlic.wordpress.com/on-romanization/

The author concludes with this observation:

So that’s why people in Taiwan can’t spell anything consistently and why all the English-language newspapers spell the same things differently. As for me, I’m giving up on trying to remember how everyone spells their name. I know lots of people, especially Taiwan nationalists, dislike having the PRC hanyu pinyin system. I dislike imposing it upon them. However, in only three weeks, I’ve found myself spelling the same thing in multiple ways and wasting time looking up how I did it last time. Since almost no one reads my blog anyway, I’ll do it the way that’s most convenient for me.

I’ll also always provide the Chinese characters so that people who can read them know who I’m talking about.

In the first place, "romanization" of English is unstandardized! Or was that unstandardised?

Korea is stuck in a funny middle ground, where names like cities or railway stations all follow the standard without exception, while personal or corporate names are in a state of total chaos. So the cell phone maker is Samsung, but the subway station in Seoul is Samseong, even though they're written and pronounced in the same way in Korean. (No, they aren't related.)

It's unfortunate but I don't think it'll get fixed any time soon. Nobody wants to be called Mr. I, O, U, An, or No. (The most common romanization for these family names would be: Lee, Oh, Woo, Ahn, and Roh.)

Yeah, my full names are Jeremia Josiah, and on my work permit they wrote the Thai version as เจอเรเมีย โยชิอา. I cannot figure out why they chose to use จ for the J in Jeremia but ย for the J in Josiah. Both are pronounced the same and I would consider จ the correct choice. I would consider ย more correct for representing a word with Y.

Thailand, famously, was never colonized by European powers. Everywhere else, some colonial administrator standardized a system of romanization.