Hubert Blaine Wolfeschlegelsteinhausenbergerdorff Sr.

Hubert Blaine Wolfe­schlegel­stein­hausen­berger­dorff Sr. (4 August 1914 – 24 October 1997; surname also given as Wolfstern, Wolfe + 666, Wolfe+585, Wolfe+590, and others) was a German-born American typesetter who held the record for the longest personal name ever used.

Source: Wikipedia — Hubert Blaine Wolfeschlegelsteinhausenbergerdorff Sr. (CC BY-SA 4.0)