when did siam change its name to thailand
Thailand The signature of King Mongkut (r. 1851â€“1868) reads SPPM (Somdet Phra Poramenthra Maha) Mongkut King of the Siamese, giving the name "Siam" official status until 24 June 1939 when it was changed to Thailand.[18] Thailand was renamed to Siam from 1946 to 1948, after which it again reverted to Thailand.