ALL OF THE KINGS of the current Thai dynasty are named Rama, plus their other long Thai names, which incorporate titles. The current King of Thailand is Rama X.
Modern Thailand was created by the work of King Rama V. Part of his longer name was Chulalongkorn. Over his 42-year reign he put a western style government in place, including a western style military and a western style finance system, had railroads built, schools, international trade, etc.
Like Japan, but not as much. Mostly because in Japan the power of the nobility was definitively destroyed. Not so much in Thailand. They got about half way there. Nobles always put their personal requirements first.
If you are an absolute monarch, and there are barons out there with their own power base,…