No Phil, not the name on Gate, you're getting confused with "Xanadu"
Rosebud was the name of Kane's childhood sleigh (in the film version) also the last word he uttered!
But as the film was based on Newspaper magnet William Randolph Hearst, who was involved with wannabe actress Marion Davies, (rosebud was his pet name for a certain part of Marion's anatomy) such a scandal at the time
This being the reason for a complete ban on any mention of the 'Citizen Kane' film by all W.R.H. owned newspapers
All very interesting Phil..considered to be best film ever made, at the time!!