Last name ราชชนก (ราชชนก , Rajchanok , Rachanrrkorn) , across the world, is an extremely rare cognomen. Much more prevalently, ราชชนก is the forename as well as the last name.
Rachachanok, Ratchainok, Ratchanerkorn, and Ratchanikhon
เพลินพนาสมุทร
, Rajchanok