The royal surname register records Thongchuea as grant no. 0225 to Luang Sewak Watchari (Thongchuea), a royal-page official in the court of Queen Saovabha Phongsri who was later titled Phraya Phaichayon Thep. Published family accounts identify the family as descending from the Chakri royal house through King Rama IV, but disagree on whether the immediate branch was Thongthaem or Thongyai. The site therefore records the established royal descent without choosing between those branches until a primary genealogical record is located.