There is a ceremonial name of Bangkok which was given by the King Rama1 and was edited by the King Rama6.
the full name of Bangkok,the longest city name of the world in the Guinness Book of Records, is
"KrungThep Mahanakhon Amon Rattanakosin Mahinthara Yuthaya Mahadilok Phop Noppharat Ratchathani Burirom Udomratchaniwet Mahasathan Amon Phiman Awatan Sathit Sakkathattiya Vitsanukam Prasit"
The meaning is
"The city of angels, the great city, the eternal jewel city, the impregnable city of God Indra, the grand capital of the world endowed with nine precious gems, the happy city, abounding in an enormous Royal Palace that resembles the heavenly abode where reigns the reincarnated god, a city given by Indra and built by Vitshanukam"
