The season 4 premiere of connected in a touching manner to . Jim Parsons was joined by Mayim Bialik, who played his wife, Amy, to provide a voiceover narration during young Sheldon's graduation ceremony that revealed the name of their son.
Sheldon: In fact, it was the best graduation party I had ever been to, until the one we had for my son. Leonard Cooper. I wanted his name to be Cooper, but Amy wouldn't let me.
While adult Sheldon might want to pretend that he named his son after the actor who played Spock, fans of The Big Bang Theory will know the name Leonard was actually a tribute to Leonard Hofstadter, Sheldon's roommate for more than a decade, and the best friend he ever had.