The longest personal name ever is 746 characters long!

The shortened versions include Mr. Wolfe+585 Sr, 585 being the amount of additional letters in his last name and Hubert Blaine Wolfe­schlegel­stein­hausen­berger­dorff Sr. This man also had 25 middle names.

His full name is Adolph Blaine Charles David Earl Frederick Gerald Hubert Irvin John Kenneth Lloyd Martin Nero Oliver Paul Quincy Randolph Sherman Thomas Uncas Victor William Xerxes Yancy Zeus Wolfe­schlegelstein­hausenberger­dorffvoraltern­waren­gewissenhaft­schaferswessen­schafewaren­wohlgepflege­und­sorgfaltigkeit­beschutzen­von­angreifen­durch­ihrraubgierigfeinde­welche­voraltern­zwolftausend­jahres­vorandieerscheinen­wander­ersteer­dem­enschderraumschiff­gebrauchlicht­als­sein­ursprung­von­kraftgestart­sein­lange­fahrt­hinzwischen­sternartigraum­auf­der­suchenach­diestern­welche­gehabt­bewohnbar­planeten­kreise­drehen­sich­und­wohin­der­neurasse­von­verstandigmen­schlichkeit­konnte­fortplanzen­und­sicher­freuen­anlebens­langlich­freude­und­ruhe­mit­nicht­ein­furcht­vor­angreifen­von­anderer­intelligent­geschopfs­von­hinzwischen­sternartigraum, Senior. 

Yes, Mr Wolfe+585 is 'senior', he gave the exact same name to his son, Hubert Blaine Wolfe­schlegel­stein­hausen­berger­dorff, Jr., who learnt to pronounce his full name by the age of 3. 

His long surname has an equally interesting meaning: "a descendant of Wolfeschlegelstein (one who prepared wool for manufacture on a stone), of the house of Bergerdorf (mountain village) who before ages were conscientious shepherds whose sheep were well tended and diligently protected against attackers who by their rapacity were enemies who 12,000 years ago appeared from the stars to the humans by spaceships with light as an origin of power, started a long voyage within starlike space in search for the star which has habitable planets orbiting and whither the new race of reasonable humanity could thrive and enjoy lifelong happiness and tranquility without fear of attack from other intelligent creatures from within starlike space." 

So next someone spells your name wrong, be glad it isn't as long as Mr Wolfe­schlegel­stein­hausen­berger­dorff's. 

(Source) (Source 2)