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French Polynesia
The Lost Tribe of Simeon is modern France and all affiliated countries.
Jacob's prophecy about Simeon:
1 Genesis 49:5-7
5Simeon and Levi are brothers; instruments of anger are in their nature.
6I never agreed to their counsels; nor did I lower myself to sit in their assembly; for in their anger they slew men and in their rage they destroyed a town wall.
7Cursed be their anger, for it is raging: and their wrath, for it is fierce; I will divide them in Jacob, and scatter them in Israel.
The promise to Simeon was that he would be scattered into the other tribes.
Unlike other tribes, say Gad, with modern countries around the world, the French usually ended up in areas within other countries and those countries are from the other tribes.
Example is the New Orleans which along with Louisiana itself has a French heritage and legal system. Yet New Orleans is part of the United States, itself Manasseh. Similarly, Quebec is part of Canada a part of Ephraim.
This displaced heritage is seen in a group called the Francophonie which clarifies the spread of French into other nations. Those are listed on the right.
Thailand is one of the few nations in the world never to have been colonized by Europeans. The linkage from Thailand to a lost tribe is thus harder to establish. Thailand is linked here with Simeon because of the long history of French support for Christian missionaries in the country. Their work was notoriously poor, yielding less that 1 percent Christians in the country to this day, even including later protestant conversion. This is thought to be in part because the country has been relatively prosperous throughout modern history. Alternatively, Thailand could be linked to Portugal and thus Gad, because the Portuguese were first to establish missions. They did not persist, ceding instead to the French.