In The Ballad of Halo Jones, the alien Proximen have to buy words to add to their names, making name length an indicator of class. A Proximan in a position of political power, for instance, is called 'Procurator Bandaged Ice That Stampedes Inexpensively Through A Scribbled Morning Waving Necessary Ankles', whereas one encountered by the heroine at a bus stop tells her, "Name is Snivelling. When can afford second word in name, will be Snivelling Earthquake."
Cable: Cable's name is Nathan Dayspring Charles Christopher Summers, sometimes appended with Askani'Son (which technically is his title, not his name) or Soldier X—leading Deadpool to add things like "Priscilla" and "Gesundheit" to the middle.
This is actually a fusion of two different "full" names (each rather long in its own right) that Cable went by at different points in his life: his birth name, Nathan Charles Christopher Summers and the name he was raised under in the distant future, Nathaniel Dayspring Askani'Son. After reconciling with his father (and realizing that his adopted father in the future was actually his real father inhabiting a cloned body), he frequently used "Nathan Dayspring Summers" as a shortened version.
In the X-Wing Series, Plourr Illo's true name is revealed to be Isplorrdacartha Estillo. All of the royal family of her homeworld, Eiattu VI, had names like that - her father was Uthorrferrell Cartha, her brother was Harrandatha Estillo. Other nobles, including her cousin and fiance Rial Pernon, have easier to spell names.
When Hellcat was sent to Alaska, the ancient crones from the place gave her the spiritual name "Double Clawed Cat Full of Red Hell Fire With Her Head Against the Wind and Comes Not Quietly From the Great Sea Road". Her comment on it was "Like I'm going to remember that."