There is frequently a great deal of confusion over the correct spelling of one
of Apogee's most prized characters, Duke Nukem.  The original spelling for the
name was "Duke Nukem"; however, during the code fix stage between v1.0 and
v2.0 of the original game, Apogee found a character overseas named "Duke
Nukem" that was thought to be copyrighted.  So, for v2.0 of the original Duke
game, the name was changed to "Duke Nukum."  Then, during the programming of
Duke II, it was discovered that the character they found overseas was not
copyrighted after all -- and so the original name was reinstated.  "Duke
Nukem" is also the spelling used in all successive games that featured the
character.

The spellings "Duke Nuke 'em," "Duke Nuke'um," "Duke Nuke'm," "Duke Nuk'em"
and other variations are not, and were never, correct.